Originally Posted by mommato7
Is 8 the magic number to make my uterus blow up like this?
This is your eighth
baby? I definitely think that could explain things! Especially if you don't have excess fluid, my guess is that you are measuring so big simply because your abdominal muscles probably aren't doing much to keep your uterus in place.
With my second (post-twins) singleton pregnancy, I measured just about the same size as I did with twins (51 cm. at 40 weeks, as opposed to 53 at 38 weeks with twins) and it was due to a combination of a large baby (10-10 at birth), excess fluid (no apparent cause), and a stretched-out uterus/relaxed abdominal muscles.
I think it would be incredibly unlikely that they would miss twins during a 28-week u/s specifically looking for twins. Twins have certainly been missed on u/s before, but generally NOT when they were suspected.
Congrats on baby #8!