2 days of period but alot of pregnancy symptoms, can i still be pregnnant?

hi im twenty one years old and in a committed relationship. we've been having unprotected  sex everyday sometimes multipule times a day:) for a month straight, including when i was on my period and ovulating.  i started getting sore breasts and weird pains in my abdomen before i got my period this month, and every at home test comes up negative so i ruled out my symptoms as pms. the first day i got my period it was very heavy and bright red and semi clear, the second was much the same but lighter. the third almost nothing was on my pad but brown spotting. today which should be day four my period is over except when i pee there is a slight weird color on the tissue. this isnt normal for me i always have gotten my period for seven straight days and my boobs have never been swollen and in pain from pms.  i also feel slightly nausueas in the mornings and actually did vomit once.  ive also had a pounding headace and im tired all the time, but like i said i ruled these out because i got my period and the tests came up negative. i read online that in some cases for the first coupple of months anyway i can still get my period? i was just wondering if anyone else had this happen to them and were still pregnant. also my boobs are still hurting even though i got my period.so far every at home test has been negative. i dont want to keep smoking and drinking if i am so this is driving me nuts.:p