Pregnancy and orgasm.

Jocelyn💋 • Have a wonderful life that I have to thank the Lord for❤️ have a son and expecting baby girl🌹
I have 2 different questions here. The first one is; when my SO goes down on me, before I was pregnant it felt good and I could enjoy it. Now I can enjoy it but, it freaking tickles so bad! I can't stop squirming. I swear I'm like a little worm squirming around lol. I can't orgasm from the overwhelming tickle! Is it because I'm more sensitive down there? 
My second question is; when ever I do orgasm my uterus gets rock hard. Why does it do that? 
This is my second pregnancy. We have a 2 year old. But I don't ever remember tickling down there lol! Please help me!