Scared?!!

So-today I'm out and about and was having stomach issues. I went to the bathroom and was cramping & all. I later on had noticed that my stomach stopped hurting but when I went to the bathroom an hour later I was bleeding(not heavily), but my period isn't due until the 2nd! Should I be be scared/worried? I am not bleeding now, though. My husband & I did have sex last night and Tues.