I do hope by now you have seen a doctor, any problems that involve your vagina just go straight to your doctor, let him look at it and sort you out.
But allways pee after sex, it cleans you out, and if like you say having sex so many times a day washing it would also be a good thing to do.
Has your boyfreind got any problems, get him to the doctor as well, best to be safe than sorry for both of you.
I don't quite fully understand what you're saying here. Do you and your partner use condoms when having sex? If not, and he is ejaculating inside you then it is normal after sex for it to come back out of you...that's just what happens. You say it's yellow though. Does it have a foul smell and do you only get this after having sex? If not, then it could be an infection so see your doctor.