Does Plan B Cause An Itchy Vagina?

I am in a long distance relationship so I don t have sex for months in between seeing my bf. I m sure he is not cheating or anything so I don t think it s an STD. We had protected sex however the condom broke so about 1-2 days later I took plan B. A few days later I got my period. After my period, we had sex again protected. Then a couple days later, I noticed my vagina was really itchy; I wiped down there and there was a brown discharge, not clumpy, just like brown blood ...shortly there after, I got my period for a second time...The second period is over, however, my vagina is still super itchy! There is no more discharges, not smell, it s not internal, just the outside part, but the itch is becoming ridiculous...is this because of the Plan B? is it a yeast infection? I am will make an appt with the doctor , but it takes a while for me to get one, just wanted some advice till then. thanks