Where’s My Period?

Here’s the scoop. I’m 15 & my period is 2 days late. I’ve had PMS symptoms for a few days now and nothing has shown up. I also traveled 2 days ago, rn I’m in Dominican. I’m trying to enjoy my trip but I’m a little worried about my period. I’ve never had sex. The most that has happened between my bf and I is him grinding on me and he didn’t even cum doing that so pregnancy should be impossible (that happened about 2 weeks ago)? Y else wouldn’t I have my period? Lol my period and I have a pre good relationship soo it usually is on time. Should I be worried cause I am.