please help me, could i be pregnat?

hi im Claudia,me and my boyfriend had unprotected sex last month on the 9th. and i was just wondering because ive been feeling really sick lately ive been throwing up, everytime i eat anything i throw it up, ive been sleeping A LOT, i get dizzy really quickly and i get a lot of headaches and then my boobs feel really sore! i was supposed to start my period last month around the 25th but instead i started it on the 6th of this month im on it right now, its stopping though… and also the thing is that i took a pregnancy test about a week ago and it came out negative, but im still feeling really sick!