I think my best guy friend picked up on my period

I love my best friend and we talk every weekend. I don't really have evidence but I get the vibes that he picked up on my PMS this last time. Normally I'm calm and rational and not totally emotional. But this past time I was on some emotional rollercoaster and he was there to see it. I was grumpy and irrational and said things to him that I regret but we worked through it. Are guys freaked out about periods? I feel like I can't bring it up to him but I really wanna know if he was just disgusted by me or if he's like... Chill with it ya know?