Bleeding while on letrozole?

Trisha

I had my period cd1- cd 4. It’s usual for me, I spot day 5. Today I am cd6, and on day 4 of the pill. Granted it is 11pm as I type this. BUT my SO and I BD earlier and was a little rough, so I thought he had made me start spotting, but it has become heavier which isn’t normal. Is this a normal side effect of letrozole? I went a whole 24 hours at LEAST without any blood of spotting at all.. I was super crampy earlier