Pain after sex?

Does anyone feel pain at the opening of their lady parts after having sex multiple times? My Bf and I are long distance so when we are together we have sex as often as we can, and after like 2 times, I start to feel pain and itchy. This has been a problem ever sense we’ve started having sex. I’m not sure if it’s due to the fact that sometimes it’s rough, he’s big, or another problem. I’m going to my OBGYN this week but just wanted to see if any of y’all have had this! Thank you:)