Miscarriage after sex?

I had a MC in September 2017. The bleeding and cramping began after my husband and I had sex and it progressively got worse until I saw my OB and she informed me I was having a MC.

I’m pregnant again, 8 weeks now, and wondering if it is safe to have sex in the first trimester? I don’t want to do anything that can harm my baby but I’ve googled and asked around and everyone says there’s no evidence showing that sex can cause a MC.