I had unprotected sex 9 days ago. I was not ovulating and he did not finish in me.This app says I was supposed to start my period 3 days ago but haven't. Other apps have said other dates. I have been having very bad cramps and a late period. Is this normal or early sign of pregnancy? I've been stressing about this which I know can cause a late period, I just wanted other people's advice/ opinion.