Should I tell him?

Me and my boyfriend have been together a for about 8 months now and I've never told him how I got sexually abused at daycare when I was little. I feel like I should tell him before we have sex because I'm scared that memories will affect me during it. But I don't know how I would or if I should because what if he doesn't want to be with me when he finds out because I have a lot of issues. Should I tell him ?