Babys hc has been measuring small since 20w scan, started at 5%tile then at 24w dropped below 1st and at 26/27 is closer to 3rd or 5th again. On my notes I saw 'baby has microcephaly' and was told that's because that's what the measurements indicate and it's to do with risk and the reason why I'm now having tests and scans. His ac is also measuring about 5th and his legs are somewhere about the 30th so he's in proportion. I'm so confused, have been told it could be something it could be nothing we will just need to wait and see. I've mentioned that I can't be as pregnant as they think I am as there's only one possible conception date which is a week after their calculations indicate but it's been dismissed every time with no explanation. I get they're not going to change the dates and now we're in this process there's no going back but if a dr or midwife said that it's a possible explanation I think I might feel more hopeful in believing it could be nothing as they say. Waiting on full amnio results but no major genetic conditions found and no viruses. I've been told to take reassurance in that and also that they've found no other abnormalities and he is continuing to grow. I just wish I could fast forward time and he could be here already so I could know if he's ok. Has anyone else been in this situation?