I just took a urine test at the doctors yesterday, [I am five days late now - but experienced a light, spotty, short period, plus a different color. - about a few days before my actual period was due - but it lasted three days not five like usual - & I believe I forgot to mention that I had unprotected sex, everyday between the days of 11th & the 21st of February - multiple times a day.] but the urine test was negative, but for some reason I'm stilling feeling pregnant. Still nauseated, bloated, breast tenderness during the early morning & sore nipples during the afternoon, fatigue like you wouldn't believe [went to bed at 7pm yesterday just woke up at 4am this morning - still somewhat tired.], frequent urination - well it was really bad yesterday, cramping of course, the very short frequent very mild headaches, the blue veins on my breast, eating more often, my stomach will growl after an hour of eating a decent meal - basically the whole nine yards. Still got a negative, I was talking to this one girl who had pretty much had the same problem, now here she is eight weeks pregnant. :]. So what I think you should do is go to the doctors [I know that's not what you wanted to hear, cause it wasn't what I wanted to hear either.], but ask them to give you a blood test if the urine test comes out negative.
If you are trying to get pregnant, I wish you the best. But I advise til you get your next period, if it comes, just act "as-if" you were pregnant, eat right & whatnot, just incase you know :].