Am I stressing over nothing or should I be worried?Please HELP!

I have been stressing over if the girl I have been sleeping with is pregnant or not. I had been waiting for her period to come and 3 days ago she got it and she's still on also it came 2 days before the day we expected it would come. I cant help but feel like she is pregnant despite her getting her period earlier. I need to know if I'm stressing over nothing or if I should be worried.

Rather than stressing, you should learn all of the facts about what you're doing. It works better if you know them BEFORE rather than AFTER.

Planned Parenthood
http://www.plannedparenthood.org/info-for-teens/pregnancy/am-pregnant-33831.asp