Sore and itchy

When I went to the loo last night I wiped and felt a sore on my privates. I found out with my last two that I am prone to having genital herpes which is like cold sores down there. It's sore and when wee gets on it it really burns. Anyone else get this and what do you use to ease the pain and should I not have sex until it's cleared. Will it harm my baby.