Pregnancy #2

Alice

I feel like I’m much smaller this time around. I have gained so much less weight but still. The dr said at 21 weeks my uterus should be at about my belly button and it’s about 1cm-2cm below?? Does that mean I’m behind? Is that normal? I had my anatomy scan and he said all was well and normal and we could just watch my growth but still that made me so nervous. Anyone else??