I'm 15 weeks in my first pregnancy and my uterus is measuring about 18-20. My next check-up is Monday, but I was suspicious and had a midwife friend double check, and she confirmed the size discrepancy. I know absolutely my dating is correct.

So my question is - if you had a size-dates discrepancy this early in pregnancy, what did the reason turn out to be? Twins, fetal anomaly, fibroids, cancer? All the worst case scenarios are running through my brain! Help!