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I am wondering how accurate transvanginal ultrasounds are? and if it is possible for them to be off by a whole month? or if it is even possible for a fetal heart beat to be dectected at 4 weeks? please help me out because i am not sure when i exactly ovulated and i really question the doctors estimates.
Hi, my doc did the trasnvaginal ultrasound twice - 4 wks apart & both during my 1st pregnancy & 2nd pregnancy - both showed that my due date is 3 days later than what my "calculated" ovulation time showed us - we never heard the heart beat of our 1st baby not at 5 wks & not at nearly 9 wks - we lost the baby ... we got pregnant immediateley there after - we had a heartbeat at 8 wks and at 12 wks - I waited specifically until I was 8 wks before I went to the doc the 2nd time - I read on a few websites that you will be hearing the heartbeat at 5 - 6 wks ... I just did not want to go though the same thing as with the 1st pregnancy.
Good luck & God Bless
it's very uncommon to see the heartbeat until at least 6 weeks and many don't see it until closer to 8 weeks. we were lucky enough to see it at 6 weeks 3 days.
the measurements in the first 12 weeks are very accurate actually, it's later ultrasounds that dating becomes very inaccurate.
we had IVF and so we know exactly when the embryo fertilized, etc.
my 6 week and 8 week US measurements were exactly correct (to the day)
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