Sunshine,
I am no expert but the discomfort you are experiencing just doesn't sound right. I would call the delivery suite ASAP. They have heard every question under the sun and you will probably feel peace of mind after speaking to them. I had swelling down there last week which seemed to coincide with a bout of thrush brought on by antibiotics. It was also on a day when I had been on my feet a lot and I thought that may have had something to do with it?

Call them and let us know how you get on. In the meantime, maybe some coolpacks or ice down there? A cool shower and hairdryer on the cool setting?