Scan dates don't match my dates?

[Sallybrids]

Hi. Wonder if anyone has had an experience with early scans showing the wrong size baby! I am supposedly 6 + 4 and had a scan yesterday as I've been bleeding quite heavily and having bad cramps. I am convinced I am miscarrying having done so before but when they scanned yesterday the pregnancy was still there. Cervix was shut and I wasn't actively bleeding when the doc looked.

That all sounds quite positive except that the sac only measured 4 weeks so its well under what it should be. This suggests to me that the pregnancy stopped at 4 weeks and I will miscarry any time now. My first miscarriage was a missed one...baby died at 8 weeks but I didn't know until 12 weeks when I lost it. They couldn't see a heartbeat yesterday but didn't seem concerned as it wouldn't show up at that stage anyway, but I have to wait a week to get rescanned and hope I don't miscarry in the meantime.

I'm petrified of miscarrying, not only because it means losing another baby, but because I'm scared of the pain too. We also had a pregnancy end this year because the baby had Edwards syndrome. I'm in my 40s and thinking this is ,y last chance.

Any thoughts?

I had to have two early scans in my pregnancy due to light bleeding. The first scan showed a heartbeat, but they said that I was measuring 6 weeks. I knew that couldn't be true because DH and I had to keep a diary of when we were having sex due to fertility issues. I knew that I had to be at least 8 weeks pregnant. By the time I went for my 12 weeks scan i was actually 14 weeks, and that would've made me 8 weeks when I had gone for my first early scan.

I think when they are that small it can often just be difficult to measure them.

DD is now a healthy 6 month old x

I was 14 days behind 'my' dates on the scan for DS1, it just meant that I hadn't ovulated quite when I thought I had. It's not uncommon.

when i had my 12 week scan i thought i was at least 13 weeks however turned out i was 11 weeks. ever since then every scan ive had by my scan date im a week out from my 'date'. my 1st EDD before i had scans it was 27th november and when i had the 12 week scan it changed to 5th december and every scan ive had i always get two different dates, one by the scan and another by my 'dates'. im now according to my scan 38+6 but according to my 'dates' im 40+1.

They can't accurately date a pregnancy by scan until after 8-9 weeks. I'm sorry to hear what you have been through and got my fingers crossed for you.