L.M.
I agree you may want to mention this to your doctor. I have found my body is using so much of my body's fluid for the pregnancy, I feel dehydrated a lot! Aside from drinking more water, you may want to look into some sort of additional lubrication. Also, encourage your partner that you need a little more in the way of foreplay and perhaps evaluate your positions to make sure you're not putting extra strain on yourself. Also..... you can use a squeeze bottle to give yourself a rinse with warm water after intercourse. It helps.