Pleaseeee

So I had protected sex (condom) almost 4 weeks ago, my period came later not that much as usual but it was normal, and after that I’ve been having cramps, my vagina is swollen as same as my stomach and little headaches.

I recently changed my birth control pills and also started taking an antibiotic for acne for over 2 weeks.

Should I worry bout something?

Or this can be ovulation?

I need some answerssss