What are the chances im pregnant?

I am over a month late for my perioud, juring that time I had un-protected sex twice with my steady boyfriend.
Last week on sunday, I took a First Response pregnancy test (one that detects the pregnancy hormone a week before your expected period) and now this friday morning I took another one. They both came up negitive. And this brand is supppose to have a 98% accuracy? Not sure. But I am going to my doctor after school today, And im going to ask to test me. I heard at the doctors its for sure or not, im not sure if they make me pee in a cup, or do blood work? But I need to find out for sure, sick of waiting. I know there is a chance for sure that I am, But what do you think the chances are? Yes I know what not to do next time, I will be on the pill + condoms. I dont need a big lecture. But those two at home pregnancy tests did show up negitive...

Dear xxxsexxx,
Even with a negative response you still could be pregnant. No test is 100% accurate. The blood test you'll get is the most accurate.
Sue...good luck

False negatives are rare. Dont stress yourself out. You're probably not pregnant. The blood test you take at the drs office will tell you for sure.