Uterus falling out @ 16 weeks?

Morgan

I have an 18m old, and I remember when I was pretty far along in my pregnancy with her that achy feeling whenever I was up and walking around. It honestly felt I just needed to sit down. Kind of a weak feeling, kind of felt like my uterus was going to just fall out. I’m 16 weeks along in this pregnancy, BARELY even showing and walking around target today I had that SAME EXACT feeling! I had my daughter 3 weeks early, and it just made me nervous. Anyone know what I’m talking about and can relate to feeling it this early in pregnancy?