Question

ma

How do OBs determine how big ur baby is or if ur baby is growing on track? My last actual ultrasound was 20 weeks. I heard they don’t do it again after that so how do they know? My OB never told me anything about the size of my baby. He measures my belly with measuring tape but he never says anything after. Plus how is that accurate? What if ur stomach was fat before u got pregnant ? lol serious question.