Period sex

So...I just started my period two days ago and when I’m on my period I get really horny and I mentioned it to my boyfriend and he told me that he wouldn’t mind having sex while I’m on it. And I don’t think I would mind trying it out at all but I feel like I would get nervous cause what if while we’re having sex and then he sees blood all over the place and freaks out?? Does anyone have any tips on having sex during periods without it being too messy? It would be much appreciated!