A red vagina is NOT a sign of pregnancy. Breast pain is more likely a PMS symptom. The redness would be more from an irritant, or maybe a bacterial infection. I would get it checked out because it could be an STD.
We dont know if you are pregnant either. A red vagina is something that needs to be evaluated by your doctor and is not a sign of pregnancy.
If you have been having sex, even protected there is always a possibility of pregnancy, nothing is 100% effective. Unprotected sex raises the possibility. If you are late for your period, take a test, or wait until the first day of your period or after a week of it being late to test. Most home pregnancy tests have a number of days they recommend to wait to test from the last time you had sex. Some say 19 days. We can not tell you if you are pregnant, the only way to tell is to test. Good luck to you, I hope you get the answer you are looking for!