Hi, i am a 26yr old female who is not pregnant as far as i know but it is possible as been trying for a few months. My query is: last night i went out with my partner and we had a meal, nothing unusual i ate, had a few casual drinks, nothing unusual, then i felt really uncomfy and threw up and there was bright red blood in it, i would say majority of vomit was blood. I was sick 3 times in a row, and then nothing. i feel ok now. why would this happen?