Masturbation may have caused miscarriage?

I have to say I’m a very sexual person & so is my partner. After learning we were pregnant for the first time in January we were both excited. Unlike many couples we managed to keep our sexual attraction to one another. Averaging sex about 4 times a week (while pregnant) In addition to that I masturbated a lot in between, all ending in orgasms. I miscarried mid February. The bleeding began right after sex. I’ve had a lot of tests & ultrasounds to make sure my uterus is fine etc. Everything came back normal. My problem is every doctor we’ve seen tells us sex is fine while pregnant, but I can’t think of any other reason for our loss. L I’m concerned now is because I’m 4.5 weeks pregnant again & I don’t want another loss. What do you think? Could sex & maturation cause an early loss. Should we tone it down a bit