Feeling weird

So im 5 1/2 weeks pregnant and i been reading up on miscarriages and im worried. I been having cramps all day today and i wore a really tight shirt and skinny jeans and im not showing so i didnt think it would hurt my baby. Well i been cramping non-stop today and i feel really hungry but food sounds so gross. Id barely push my stomach and it would start cramping. ive been really really tired. My friend said its my uterus stretching... what do you guys think?