I would get checked. I only feel a little swollen after after and my doctor said you can get Braxton Hicks following orgasm.
Yup I'd say yeast infection. Same thing happened to me around week 12.
I feel a little sore and swollen after sex. Theres a lot of blood flow down there.. maybe mention it to your dr if its painful tho..
Yeast infection go talk to your doctor and he will give you medicine for it(: