Baby will come when ready. I was having sex 39-40weeks pregnant and 3cm dialated and still didn't go into labor. Just had bad contractions that kept me up all night lol
Will for sure make you contract, but your fine unless your doctor has told you otherwise
Its not dangerous. But it can trigger contractions. In fact, they suggest sex to help induce yourself. It never brought on labor for me with my four, but I did bring contractions. So no worries.