Getting closer to testing day!

So I've been using this app and im suppose to start my monthly in just a couple days, my boyfriend & I have talked about having a child together after two years of being today, he's almost 24 & ready to start a family, we recently just started trying about a week ago, but the app says there is a 3% chance of pregnancy (let alone we have sex up to 3x a day) would that make any difference or is there a way that it could do nothing at all considering the app says 3% chance. My mother and her mother before her never had a problem getting pregnant ! She got pregnant her first time. I see girls get pregnant all the time but is that JUST because they've gotten pregnant during ovulation? Or is there a chance I could be pregnant? Guess I got a couple days and see if aunt flow & uncle red come into town !