So on the 29 th of January thur the 1st of Feb I was ovulating . Me n my boyfriend had sex on the 30 th unprotected about 4 times . After that I started to feel weird I been throwing up mostly every meal I eat that is heavy, I feel nausea, I'm tired alot n I had some Brown bleeding like five days ago Now I was suppose to cone on my period on the 14th Valentine's day it haven't came yet but yesterday morning I started to bleed about thirty mins later it stop . N today in the morning I threw up at work started to bleed again then stop what you think is wrong . I came home n felt nausea again like I had to throw up n i haven't started bleeding again.could I b pregnant?