Negative Pregnancy Test but still worried.... HELP?!?

So me and my boyfriend last had sex December 26, 2010. We used a condom and everything but his penis was around my vagina without one later on that night.. (which is kind of why i'm worrying). My period before that had ended the 24th.. So about 4 days before my next period my nipples and only my nipples got kinda sensitive and sore but then i started my period January 13th.. and my period was pretty heavy until about the 15th and then light the 16th and was completely done by wednesday the 19th. Recently i've noticed that my boobs are kinda bigger? Which could have been the reason my boobs were sore in the first place, or they really arent bigger and i'm just imagining it. My period was due this weekend (the 4th, 5th, or 6th) and i've been stressing out about it alot and its now the 6th and it hasnt started. I took a first response test and it came out dark pink, negative. Then i took a dollar tree one, and it also came out negative. Should I still be worried or do you think i'm stressing out too much? honest opinions please. I really don't want to be pregnant so I'm hoping the first response was right. (I've also read that they are pretty reliable... sooo..) Careers_Employment pregnancy.yifei8.netParenting

** Its been 6 weeks since we've last had sex. So I figure that IF i was pregnant, i'd be around 4-5 weeks and the test would most likely come out positive if i actually was!

Pregnancy tests are not 100% fool proof so there is a slight chance that you could still be pregnant. I would try to relax and wait for your period to come, and if it's a week late I would take another test then. Stress can do all sorts of funny things to your body so I would try to think positive. Good luck!

Your periods probably late because you are stressing out over it. Stress can sometimes cause a late period. If you conceived on the 26th than you would have had a positive test by now if you were pregnant. I say if you don't get your period with in a few days to be sure.