Achy vagina.

I'm 37+4 weeks and my vagina has been extremely achy lately. 
It's deep inside and is sore when I walk or move or even sit. Is this normal? 
I don't want to freak out and go to the hospital of it's nothing because we live 45 minutes away and we can't really afford to just go. 
What could cause this? It's mostly achy inside... Not from intercourse