Painful sex

Hi guys! I’m not sure why, but for a few months now I’ve been having very painful intercourse. When my partner goes in me it feels like a knife is just cutting me apart. It’s so painful. Sometimes its ok it doesn’t hurt as bad and I can manage, but there’s times were the pain is unbearable and I’m so uncomfortable and just hurting. I’ve never been to OBGYN, and I made an appointment but won’t be until mid-November. Has anyone ever felt this before?