I am not preggy, but i feel some symptoms i also had my period.. whats going on?

last dec. 12 i lost my virginity, and by Dec 17 my period started, it seems it was normal. HE pulled out his penis. BUT THEN IM STILL CONFUSE! until now, DEC 29 I lost my appettite, feeling vomit anytime but theres somethiny in my throat, then i drink plenty of fluids than before, and urinate more than before, i does have those symptoms of being preggy,. BUt I'm not sure, and the possibility is too low because I already had my menstruation..