weird sharp twinge in my vagina

Started feeling this sharp twinge feels like inside way up in my vagina. It's a feeling like if something's trying to get pried open. (Best way to describe it) a few weeks ago. The last week it happens daily every few hours. It hurts and it does make me stop what I'm doing cuz it hurts but it's only for a few seconds. What could it be? I'm 34 weeks today FTM