Sex while pregnant

I am currently 18w 5d pregnant with our first baby! Sex, here lately, because I am showing and my lower belly is so sensitive, has become extremely hard and its not enjoyable! Missionary is the only position I can do that isn't painful! And with the growing belly I am becoming more concerned about my daughter being squished or just my belly being laid on because of the sensitivity. Does anyone have any advice for different positions that may help that wont be too painful! Any advice is welcome! Thank you!