Early scan - identical twins reassurance

Hi Everyone
Had an early scan yesterday, only to find out that I'm carrying identical twins! Only issue is that I thought I should be 6 weeks and 3 days, but the babies both measure 4 weeks and 6 days! I'm pretty certain of my dates as had been having bloods for ovulation etc, and if they were only 4 weeks and 6 days, I would have conceived the day that I got my positive pregnancy test!
The sonographer said she could see both heartbeats, which i didn't think would even be possible at less than 5 weeks.
Is it possible that my dates are right and the babies are just measuring smaller than expected? Any reassurance or similar stories would be appreciated!
Thanks everyone
Had an early scan yesterday, only to find out that I'm carrying identical twins! Only issue is that I thought I should be 6 weeks and 3 days, but the babies both measure 4 weeks and 6 days! I'm pretty certain of my dates as had been having bloods for ovulation etc, and if they were only 4 weeks and 6 days, I would have conceived the day that I got my positive pregnancy test!
The sonographer said she could see both heartbeats, which i didn't think would even be possible at less than 5 weeks.
Is it possible that my dates are right and the babies are just measuring smaller than expected? Any reassurance or similar stories would be appreciated!
Thanks everyone
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Replies
I had an early scan due to my history and it ended up being a vaginal scan, she measured me 4 days earlier than my date suggested so I'm not going with that date. Got my next scan on weds (I'm actually due in September but there doesn't seem to be a thread for that yet!)