Last week brought the heartbeat — a first flicker of something visible and verifiable. This week the story shifts inward, to something invisible but arguably even more staggering: the embryo's brain is now producing around 100 new neurons every single minute. That rate will continue and accelerate throughout pregnancy and into the first years of life outside the womb. The human brain is the most complex structure in the known universe, and its construction is already well underway at 10mm.
The embryo has grown to about 10mm — nearly double last week's 6mm — and the head remains disproportionately large, accounting for roughly half the total length. This is not unusual; it reflects the extraordinary metabolic investment being made in brain development relative to the rest of the body. The trunk and limb buds will catch up progressively.
The arm and leg buds that were barely visible last week are now elongating. Small paddle-shaped structures are forming at the ends — these are the earliest hands and feet, and they are webbed. The tissue between what will become fingers and toes will gradually break down over the coming weeks, separating them one by one. At this moment, your baby has webbed hands and feet, a fact most parents never know.
I looked up what was happening at exactly seven weeks for some reason — I think I was trying to make it feel more real. And I read about the webbed fingers and toes. Something about that detail — this specific, strange, temporary thing — made it suddenly very real. There was a particular creature in there, with particular features, at a particular moment.
The face is continuing to differentiate. The eyes — which formed as dark spots last week — are now developing a retina, and a lens is beginning to form. The nostrils are present as small pits. The jaw and palate are starting to take shape. The embryo, if you could see it clearly, is beginning to look recognisably — if still rudimentarily — like a face.
The physical experience of week 7 is, honestly, much the same as last week. The nausea, the fatigue, the smell sensitivity, the food aversions — all of it continues. If anything is different, it is in degree rather than kind: some people find week 7 slightly easier than week 6, and others find it slightly harder. The general window of peak first trimester symptoms is weeks 6–8, so you are somewhere in the middle of the worst of it, or just coming through it.
Rather than restating what is already happening, here are the things most specific to this week.
One thing worth noting as you move through the first trimester: the symptoms you are experiencing — however severe — are not a measure of how the pregnancy is progressing. A bad week does not mean something is wrong. A week where symptoms ease slightly does not mean something is wrong either. Symptom fluctuation is normal, and the absence of symptoms on a given day is not a warning sign.
By week 7, the secrecy of early pregnancy — which was noted last week as one of its more isolating features — can begin to feel more actively difficult. You are three weeks into carrying something that is consuming enormous amounts of your physical and emotional energy, and for most people, the circle of people who know is still tiny. The weight of that can accumulate.
This week brings a particular kind of exhaustion that is hard to name: not just physical tiredness, but the fatigue of holding something large and private while continuing to function normally in the world. Going to work. Keeping up with friends. Pretending nothing has changed. It is a performance that is invisible and tiring in equal measure.
Week seven was the week I nearly told my boss, not because I wanted to but because I was so tired of pretending to be fine when I felt terrible. I didn't — I kept going until twelve weeks — but I understand now why some people tell earlier. The secret is genuinely heavy.
There is no correct time to tell people about a pregnancy, and the 12-week convention — while medically rooted in the point at which miscarriage risk drops — is a social norm, not a rule. Some people tell a small number of close people early, finding that the support outweighs any possible awkwardness. Others keep the circle tight until after the scan and find that preferable. What matters is that you are making a choice, not simply enduring a convention that is making you more isolated than you need to be.
If you are struggling emotionally this week — not just physically tired, but genuinely finding the anxiety, the secrecy, or the uncertainty difficult to manage — it is appropriate and sensible to speak to your GP. Antenatal anxiety and depression are real, common, and underdiagnosed. You do not have to wait until after the baby is born to access support for your mental health.
The themes of week 7 connect to these full topic guides.
The practical realities of weeks 5 and 6 — the food adaptations, the patience with fatigue, the covering for social situations — are still the context. By week 7, if you are doing those things well, you may have settled into a rhythm of sorts. That rhythm is worth maintaining even when there is no dramatic new development to respond to. Steady, undemanding support across these weeks is more valuable than intense attention that comes and goes.
The specific emotional texture of week 7 is often about the secret — its weight, and the question of when and whether to ease it. Your partner may be wrestling with the 12-week convention in ways that are hard to articulate: wanting to tell people, not feeling able to, and not always being able to explain why it matters so much. If the question of telling people comes up, approach it as a joint decision rather than a policy to be applied. There is no single right answer.
- Check in about work. Seven weeks of significant fatigue and nausea while continuing to work full-time is genuinely demanding. If there are practical things that could ease this — adjusting schedules, taking on more at home in the mornings, covering commutes — now is a good time to have that conversation.
- The vivid dreams may be disturbing your partner's sleep — and therefore yours. This is normal and largely untreatable, but acknowledging it ('I know you're not sleeping well on top of everything else') is useful.
- Notice the performance. The effort your partner is making to appear normal — at work, with friends, in everyday interactions — is real and exhausting. Acknowledging that you see it, even briefly, matters.
Think about who, if anyone, you want to tell. Not because you should tell anyone — but because the question of secrecy versus support deserves a deliberate decision rather than simply defaulting to convention. Some people find that having one or two trusted people who know makes the next five weeks considerably more manageable. Others feel strongly that they want to wait. Both are valid.
If you are going to tell someone before 12 weeks, think about who you would want to know if the pregnancy did not continue. The usual logic behind early disclosure is: if something goes wrong, you will want support, and you will want to have someone already in the picture. That is a worthwhile consideration, not a morbid one.
Your booking appointment is the right moment to raise this — particularly if you have been experiencing mood disturbance, anxiety, or low mood alongside the physical symptoms:
Booking appointments include routine mental health screening, but the questions are often brief and can be easy to underreport on. If you are genuinely struggling, say so explicitly rather than relying on a brief questionnaire to capture it. Perinatal mental health services exist specifically for this; referral is appropriate and available, and early support produces better outcomes than late support.