Most embarrassing thing/ what do I do?

So I was at my boyfriends house tonight (tomorrow we wil be a year) and I didn’t expect to have sex or anything. He ended up eating me out which he usually doesn’t do. (1: is this weird that he doesn’t do this but expects me to give him oral? ) after he did that we had sex and I didn’t realize until after that I had my period. 2: Would he notice this at all? Should I bring it up? Or keep it inside? It would be weird if I bring it up tomorrow to me cause it’s our one year or maybe it’s just me? Need some insight!!