8weeks pg but measure 6w3d... heartbeat of 143

DRLele

I went in this am for my first u/s today, which is exactly 8weeks since LMP.  U/S Tech measured the baby at 6w3d.  The baby showed a heartbeat of 143bpm.  I am very worried, as I had 2 mc prior to this pregnancy.  Does anybody have any insight or experience in the low measurements?

chardonnay24

You may have ovulated later than you thought. Do you have 28 day cycles? When I got pregnant with my first, I had really irregular cycles. Based on my LMP, I "should" have been 14w at my first appointment, but based on when I thought I conceived, I estimated I should have been 7w. I was actually 6w, and I have a healthy almost 3 year old today.

Same thing with this one, but not as large a difference. Based on my LMP, I should be about 7w now, but I estimate that I'm only 5.5w based on when I think I conceived.

DRLele

I have a 28 day cycle.  I expected AF on 12/10.  Did HPT on 12/11 and got a faint positive. HPT on 12/14 and got BFP.