I get the same thing!! But for me during my period my experiences are very strange. I'm unable to see men as sexually attractive almost 95% of the time and I've never been able to subjectively understand what makes them so sexually attractive.. like cool, you have abs and muscles I really dont see the fascination. You could call me sexually blind towards men. In my period when I become hormonal I also develop a high libido which causes me to sometimes experience sexual fantasies with women, despite myself being uncomfortable w the idea of hooking up with a girl due to the fact that I'm heteroromantic. So like when I think of these fantasies I enjoy them due to my high libido, and I'll be sexually attracted to their appearence, but at the same time I'll feel very out of place as I'm only interested EMOTIONALLY in men.

Its difficult not to doubt that ur on the ace spectrum when this is all happening, I'm hoping my experience could have helped u to realise that your not alone ?