So I used a pregnancy calculator and found out I'm only 4 weeks along I thought I was 6-7 just due to the size of my little belly, wondering if it could be twins or just big because I was pretty small to begin with or if it really was twins if me so blessed either way but I'm seeking advice because well I've never been pregnant but my boyfriend says his family has twins and I don't really know my extended family because most of them were adopted on both my mother and fathers side.... what do you think am I overthinking things or is my belly actually bigger than most at four weeks?