I'm dry!

My fiancé and I make love rearly due to our personal decision. And when we do I'm so aroused but after a round my Yoni feels really tight and I can't even continue in the next. I know it's not my attraction to my fiancé. But my concern is I'm giving a water birth at the end of June and if I can't take this pain how will I with our sunshine, naturally. I know it's not what I'm eating I'm on an alkaline diet as well as I'm vegan. I guess I'm looking for you can do it. Or Ive done it natural with the same sex pains. Ect. Wish me luck.