pregnancy symptoms of nausea, sore breasts, tired

Here's my story for you to read, to maybe think bout what you're going through. Now here it is March 4th of 2008 {last period was February 2nd - 28 day regular cycle.}. Already past my period by about four days now, I have a really good feeling that wasn't my period, the bleeding I experienced back in February {24th-27th - the light, spotty, short, pink/brown/burgundy red bleeding. - my normal periods last for five days & are heavy.} Anyways, today I went to the doctors & they gave me a urine test, came out negative. But the thing is I'm still having these symptoms: nauseated - actually threw up in my mouth alittle bit earlier, sore breast & nipples & they seem to be alittle bigger - atleast alittle more cramped in my bra than usual - the thing about them being tender is it's not all day it really depends on what time of day it is (as weird as that sounds), I really don't feel myself to tell you the truth, bloated to the extreme, starting to use the bathroom a lot more, I actually have what it seems like menstrual cramps but they're not as harsh, really tired lately but finding it hard to sleep since my mind has been on this whole pregnancy thing - & I have noticed I can't fall asleep til the wee mornings then it seems like I sleep all day & stay up all night - although when I'm awake I feel as though I didn't sleep enough even if I slept for twelve hours, short frequent mild headaches, I can see blue veins in my breast sometimes they're not as dark as other times so I really don't know what to think about that.


& just as a mental note: I had unprotected sex from February 11th through the 21st, every day in between those days, multiple times a day...