I had my growth scan on Monday (36 weeks) was 35 + 4. She has dropped from the 33rd percentile to the 13th. She’s still within normal range…just (10-90). It just seems so scary.
Has anyone has anything similar? I’ve done the worst thing and googled and it says she may have a chromosomal/ genetic issues. I have a rescan in two weeks so hoping she’s caught up. So stressed 😩
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The scans are an estimation of fetal weight, and the further along you get the less accurate they are. So I really wouldn't worry about it

When pregnant with my LG, at my 36wk scan she had dropped more than 20 centiles total and her stomach was not in proportion so they scheduled a scan at 38wks, they did say they had no concerns about placenta blood flow so we're happy to wait 2 weeks for the rescan.
At the 38wk scan, it was a fetal medicine Dr doing the scan with a more in depth ultrasound scanner and they said the placenta flow was still normal and that she hasn't dropped as much as the 36wk scan showed. They think because she was so active at that scan the sonographer hadn't been able to get the measurements as well.
The 36wk scan showed a total centile around 40th centile and she arrived at 42wks (following an induction due to post dates) at around 50th centile with no genetic issues.
Hope hearing our story helps.

Ask for weekly dopplers to ensure the blood flow in the placenta is good just for peace of mind. Growth varies, baby may catch up in 2 weeks. Try not to worry, eat and hydrate :)