Sex while pregnant

Tiffany • Married💍 Mommy of a handsome rainbow prince! Matthias mommy loves you! 7.5.2019 🤱🏻💙🌈👶🏻

So me and my boyfriend are expecting. We believe we’re around 8 weeks (will find out Tuesday). Well for the past few weeks (even before getting the positive test) when we would have sex. After I would get a cramp for a few seconds. Not right after. A few moments after. And he doesn’t go too rough, he doesn’t poke anything. He’s very careful. What are these cramps? They feel like a pressure and stretching feeling. It’s very hard to describe. Please help?