Okay, I’m trying to understand this. My dr said ultrasounds are pretty accurate on the age of the baby. My last period was Dec 1. I didn’t ovulate until Dec 22. I stayed on top of this and we had sex on the 21 and 22 so that’s when I had to get pregnant right? Well, there’s about 5 days according to the size of the baby that shows I didn’t get pregnant til Dec 27. We didn’t have sex anytime then.. I’m not sure if this makes sense to y’all bc I’m not understanding myself.. anyone have any idea?