Top part of vagina opening is swollen and a tip of what looks like blood after intercourse?

I'm 17
Also Pregnant 6 months
(Not sure if this has to do with it)
Started feeling dry and in pain
The opening of the vagina where intercourse takes place is swollen and part of it is dark, blood maybe?

What Ruby_saphhire said isn't true. According to the Mayo Clinic, "As long as your pregnancy is proceeding normally, you can have sex as often as you like."
http://www.mayoclinic.com/health/sex-during-pregnancy/HO00140

I don't know anything about your symptoms, though. You can call your doctor's office or insurance company if either one has a nurse's line. If you have access to a nurse's line, a nurse can give you more info.

You can chat/text/call a women's health professional for free at plannedparenthoodchat.org.

You can research your symptoms and figure out if you need medical treatment at
http://www.mayoclinic.com/health/symptom-checker/DS00671