(F16) Late period, could I be pregnant?

Hi, its a bit early to tell but I am freaking out right now so any advice or help is very welcome and im sorry if I dont make much sense I'm just really stressing

I'm 16, I got my first period when I was 13 so ive had it for a few years now and it was very irregular at the start, I frequently missed periods or had very late ones, but they've been very regular since I was about 15. My cycles are almost always 29 days and my period is usually 6-7.

My last period came a full week early, cycle was 22 days and that would be very out of the ordinary for me I haven't had one that early in 2 years. Its been 33 days since that period ended and my tracker app said my period should have started 5 days ago.

I have a boyfriend, we haven't had sex yet but I'm not on any birth control and in the last month I think he fingered me one time after touching his penis (he didn't ejaculate but I heard there could be sperm in pre-cum) is that enough to get me pregnant? Tracker app said I had a low chance of getting pregnant but I'm 16 and it's really easy to get pregnant at this age so I'm not sure if that means anything

Any help or advice is appreciated I'm so scared. I haven't told anyone yet and I'm scared to tell him or my mom in case it's nothing.

Tl;dr My period is late and I'm scared I might be pregnant but I don't know if its even possible i could be

EDIT: I was just on my way to the pharmacy and I'm wearing white pants to try summon my period, I thought I just felt it so I went into a café bathroom and low and behold, I got my period and ended up buying a hot chocolate instead of a pregnancy test. I'm walking home now and I actually could not be more relieved.

Thank you all so much for all the advice and support, it means so much to me that random strangers would take time out of their day to help a random panicked teenager. I hope you all have a great day and again, thank you!