What Causes A Feeling Of A Torn Vagina?

I will be 36 weeks pregnant tomorrow and I feel like I have torn down there. I haven't had sex in a very long time so I know it's not from having sex and also I havent done anything for me to get torn down there. I feel torn in the same place where the doctors usually cut during birth. I go back to the doctor soon so I am thinking about telling him. Do you think I could be close?!