Pregnant? :'(

I'm 15 years old, the first time I had sex was on the 16, it was unprotected. I'm super scared I may be pregnant. He did not cum inside of me and we did not have sex for that long. It didn't feel right. My period is supposed to come in 4 days according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>. Also according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> there is an 8% chance I could be pregnant if I had sex on the 16 or a 22% if I had sex on the 15. Technically when I had it, it was Monday because it was at 2 in the morning but I don't know what to consider it. And I'm freaking out bc I can't go to the store to get a pregnancy partly bc I'm broke and have no money and I can't let my parents find out. What should I do and am I pregnant??? Help!