TMI conversation no pics

So first off I wanna say I'm a very clean person when it comes to my lady parts. For the last 2 days the opening/inside of my vagina has been swollen. There is no pain no itch no irritations and ragular discharge. I know sometimes this happens from intercourse but since I have had it have purposely not done that being scared it's a infection or something. I tried to google it but nothing really helped. I don't know if this is common I have never had this happen so I'm open to anything! Please help! One of my friends that just had her baby said this happened to her but I just guessed she was father along and pressure caused it but who knows. I have been just waiting it out but I wanna know if I should buy some infection stuff or what to even buy.