Sex cramps

So I've deprived my poor husband. I asked doctor and she said sex was safe during pregnancy and that it would not increase any chances of miscarriage.

Well we did the deed. I had a drop of blood but I think it was from possibly him tearing me a little. But after that nothing. However I am sort of cramping. Nothing painful or accompanied with bleeding

But has anyone experience some cramping or tender abdomen after sex? I'm 5 weeks and 4 days.