Late period

So my period is late and that's kinda unusual, there's a few things I think it could be. I've been out in the sun and in pools and stuff the past week (my period is now 5 days late) I've also been stressed a little about work and now about my period being late but the main worry point is that my BF and I had sex technically on Friday the 24th. The intercourse part wasn't long at all just a few strokes I guess (it was our completely first time) and neither of us finished but I'm worried that there was maybe like some pre-cum??? Any thoughts?

Also no condom or birth control bc we didn't plan on doing it.

Edit/Update: I got my period, y'all everything seems to be all good and normal