Period 20 days late

So usually, I get my period and then I’m off of it for 2.5 weeks and then have it again. But recently this year, I’ll have regular cycles (4 I’m a row) like that and then have a cycle that is 5-7 weeks break. Right now, I’m in the longest cycle I’ve had yet, and I’m a little worried about what that means. I’ve never had sex, but my boyfriend and I do sexual things. We fool around but never p&v; contact, or cum anywhere near my vagina.

Does anyone else have this ? Should I see a doctor?