Is it possible to be pregnant with twins and not know it? I had two ultrasounds so far, one at 6 weeks and the other at 8. They only found one each time but idk I just wanted to know if this has ever happened to any/ if it can happen? My stomach has gotten quite big already and this is my first pregnancy (I’m 13 weeks now). And no it is NOT BLOAT. My friend who has had four kids saw my belly was really shocked and said are you sure it’s not twins? Others have commented the same... it’s kinda freaking me out🤣