yes get it checked out right away.
you may have a growth like a fibroid or polyp in your uterus that has moved down to the vaginal canal where it will cause pain in intercourse. those things are serious and can cause miscarriage.
I would talk to your doctor about it. Because you're pregnant...many things are more sensitive due to more blood flow to that area. I don't think it should be black out painful though...that sounds abnormal and I would get it checked out.
I too have experienced this same unexplained pains. I have yet to go to the Dr.. Did you discover what the trouble was?