Pain in right lower abdomen

Sabine • Law & IR student 🇳🇱 the Netherlands. First baby born in May 2019 👶🏼💙
I've been having annoying pains in my lower right abdomen, AF is due in 4 days. I've been having it for a whole day now, what could it be? First I thought it was my appendix but the pain is not getting worse so I guess it can't be appendicitis