Miscalculated due date ?

[Forevergrateful2015]

so first I was supposed to give birth sept 11 according to my last menstraul period . But when they did the sonogram she said the baby was to small for at the time to be 8 weeks that I was 6 weeks . So she referred me to a specialist to check that out . Has this happen to any one ?

[BabyJVD]

I'm due sept 11th and the first day of my last cycle was Dec 5th

[lindashalee]

You ovulated later than is "regular" my first pregnancy was way way off. I went a cycle and a half before I ovulated. So from my period I was like 10wks and by first ultrasound I was 6wks

[lelesky1]

I'm supposed to be 8 weeks and 4 days and when they did the sonogram it appear it was 5 weeks!

[JKODFD]

Happened here too! Was supposed to be 9 and they told us 7. I figured though because I had pcos and my cycles weren't regular. The way they first calculate the due date is if you have perfect 28 days cycles and you always ovulate on the 14th day.