Period Sex, nervous

I've had some long periods and it has ruined my sex life. Sometimes I'm super heavy, sometimes I'm light. I want to try having sex with my boyfriend but I'm nervous because I don't want him to be grossed out if blood gets on him. I would feel so embarrassed. He said it wouldn't bother him but the thought of him having to rinse off MY blood on him makes me feel disgusting even tho I shouldn't. Has anyone ever felt like this ?