30 weeks pregnant first pregnancy, but i seem to be the same size i was at 20 weeks, doctors never said anything was wrong is this normal not beingbig?

Ask your docs: When a woman is pregnant one if the things doctors do each visit is to measure the height of the uterus. This is done by measuring from the pubic bone to top of uterus. The measure in cm equals the number of weeks she is. Generally if the measure differs from # of weeks by more than 3 cm an ultrasound will be done to check. Long waisted women look small. Ask your doc about your measure and concern.