Any idea what this could be?

Mary • 20 years old, engaged, mommy to a babygirl born on July 22nd, fur momma to my Yorkie-Poo, Zelda :)
For the past 2 days or so, I've been having a random pain on the right side of my vagina, about an inch inside on the wall... I haven't felt up in there so I don't know if there is a bump or anything, I'm just wondering what it could be from? I'm hoping it's not a sign of preterm labor or something =/