Confusion!

Okay so this app is crazy. It logged me out on its own and my whole fertile window and period dates changed for this month. I wouldn't even trip on it because I just use the app to log my period but this time I actually had sex and didn't know it was the whole window until after. I got one of those 6 days before test and was planing on taking it 4 days before my period was suppose to start... But now that the whole thing changed I have no idea when to take the test if it was wrong in the first place and if I'm pregnant or not. I'm only 16 and I told my mom about everything but I just want to make sure because a baby at my age? Yeah not good.