I have been having a pain in my vaginal area, a pain that feels like someone keeps sticking a pin in my opening. It's not constant, it comes and goes. I am a little concerned because this is unusual for me..there is no unusual discharge anymore...there was a dark green "stain" in my underwear after my period went off, but that was it. Any suggestions on what is going on? i want to add that this sensation occurs after my bf and i have sex.