I kinda need advice

So my boyfriend aND I anniversary was on the 17th. We have been together for 8 years now but we have never had sex while I was on my period but I can't stop thinking about sex with him these past few days and I told him and he goes if you want to have sex we can but I don't know of I'll stay hard or not and I will get so turnt off if I see blood. But I told him I don't know if I want to have sex while on my period. I feel like that would be so gross. So what would you guys do or do ?