Precum pregnancy

Ok so like I know I can get pregnant with precum. But like about 6 weeks ago I had unprotected sex and he pulled out but there's quite a few problems.

1. I don't know if he precum

2. I'm not sure if he had peed before we did it

3. I'm already irregular so I have no way of knowing.

4. According to this app I'm 5 days late *doesn't matter I'm irregular anyway*

5. I've only had this app for about a month, but I filled in the last time I had my period but I couldn't remember any time before that.

Like I've been freaking out for like 3 weeks. BTW I'm 17 and I've been with my boyfriend for a year and a half. When this happened this was my 2nd time having sex.... so I'm freaking out.