Late period

My last period was January 4th, and I haven't had it since. I used the one period app to help track my due date and it's saying im two days late. I have a certain discharge and the Internet is saying it's normal but then it's satin it could be pre pregnancy. I'm only 17 and I'm terrified of getting pregnant. I never used to keep track of my period but this is the first time I used that app with the flower, im just freaking out . Me and my boyfriend don't use condoms but he pulls out every time. Can someone please help me so I don't have a panic attack