Sex while pregnant

Sidney • 23. Mommy to a beautiful little boy as of 2/8/18 💙🤱🏻 Rip Oliver, our son may never get to meet you but he’ll know who you are 2/1/18

So the last couple of times I’ve had sex I’ve cramped up extremely bad, I’m usually on top. I’m 25 weeks and 4 days, I’m accepting that we’re going to have to change it up, what do you ladies recommend?