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Pregnancy

Talk about every stage of pregnancy, from early symptoms to preparing for birth.

Measuring ahead on dating scan?

3 replies

BabyWA · 14/01/2026 09:04

Hi! Just looking for some advice... I'm currently in my third trimester and I have not really questioned this until now. My LMP was 4th July and I have 30 day cycles-ish, well I'm regular anyway. I wasn't tracking ovulation but looking back at my dating scan on 25th September, they dated me 12+4 with a due date of 5th April? Meaning that my LMP started 29th June.

I'm not too sure how it works, but I thought my due date would be around 12th April! I'm a bit worried if it comes to being induced or scheduled C-section and my dates are wrong. According to my scans I would have ovulated on cycle day 10?! Is this even possible?! 😆

I'm just wondering if anyone else has had this?

OP posts:
BudgetBuster · 14/01/2026 10:10

Your dating scan would have been based on the size the baby was measuring. Usually if it just out by one or even 2 days they won't change your due date but if it's out by 5+ days they'll redate you.

SmaugTheMagnificent · 14/01/2026 10:41

Yes you can ovulate on CD10. If you ovulate as early as this, you are less likely to get pregnant but it is possible.

I ovulate CD12 and get pregnant easily. If you ovulated CD12, your dating scan is only 2 days out, which is perfectly normal. I track ovulation with two pretty precise methods, and have been dated 3 days out each time. I just remembered I had that extra 3 days and would have refused induction (or requested it 'early', depending on which direction they were wrong)!

Peonies12 · 14/01/2026 11:03

It’s only a few days difference, I really wouldn’t worry. It’s all an estimate anyway. If you don’t want an induction or c section then just say no or that you want to wait. It’s normal to go to 42 weeks unless there’s a genuine concern. You can definitely ovulate on day 10.

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