I last had sex on 24rth and 25th of this month and during the intercourse i felt quite an amount of dryness in my vagina and felt pain as well. After approximately 2-3 days i observed a big white patch growing under the vaginal opening and a little redness as well. I also felt pain during peeing in the beginning and I haven't seen this type of situation and condition ever before. I just want to know what my body is going through and what exactly is happening.