I'm 22 weeks 6 days and the bottom of my vagina is swelling a bit. It's not painful but it isn't very comfortable. I think its the increase in blood. I shouldn't think it's anything to worry about. Maybe talk to your doctor or midwife and they can let you know how to relieve it.
Depending on how far you are it may be pain from baby moving down. I had pain start at 30 weeks and doc said bc he was low and head first. Maybe that's why too? I know the pain very well!
:-( seems to be going around
On your pelvic area? Its normal theres nothing the doc can do mine came with a little swelling