Pregnant or just more active?

My periods are normally very regular, it comes either 16th or 17th of every month, however I haven’t started yet and it’s now the 19th. Me and this boy have been having a lot of sex for just over a month, protected of course. However, when we done it a couple weeks ago, I rubbed my clit after wanking him off (with precum on my hands) so is the no period due to a potential pregnancy or is it just because I’ve become more sexually active?