10 days late

I'm 15 and for the past 4 months my period has been every 28 days like clockwork. Granted, before that and the reason I got this app was because I was a week late due to stress and I thought I was pregnant. I'm even later this time and I can't help but think it even though I know I've been stressed out to the point where I was crying at night almost every night for a week or two. Earlier in my cycle I was dumb and let my boyfriend put it in without a condom for a second. He was nowhere near cumming but still it's possible right? I'm gonna see if one of the seniors I know and trust pretty well could get me a test because if I am I need to know so that I can handle it.... But my boyfriend, unlike before where he was also freaking out, keeps reassuring me it's nothing...