V PROBLEMS ?

Okay so I had sex with a old friend two days ago everything fine . Got home shower .everything fine !The next day I woke up and showered again now here the issue ! (I've been using this soap named zest . )I bought a 3 bar pack and I'm almost done with my first bar n I have got rashes on the first two days of using the soap . But haven't got rashes no more .Now that the bar almost done my V is itchy but the discharge is normal and I have normal odor . What can it be ?