Doing everything right.. still get pregnant?

Elizabeth

So I'm 16 and I just recently started having sex a month ago. My boyfriend and I only do it about once or twice a week. I'm not on birth control, but every time we have sex we use a condom and he pulls out, and then we fill the condom up with water to check for holes or breaks. The condom has never broken or come off, and he has never ejaculated anywhere near my vagina without a condom on. It seems to me like I'm doing everything right?

Right now my period is 3 days late, and i've had some bad gas pains as well as a little bit of menstrual cramps, sore boobs and one dizzy spell. I've been stressing for the past 2 weeks that I might be pregnant.

What do you think??

UPDATE: I took a test today(7/24) it it was a strong negative!!! Scariest thing i've ever had to do! Thanks for all your responses!