Me and my boyfriend had sex for the first first time a couple of days ago, we have done it about 4 or 5 times and things got pretty rough and now i am in severe pain, he had a look and there is a tear at the opening of my vagina, it stings when i go to the toilet like crazy and it hurts when i walk, i also noticed some blister type things appearing, please please tell me it is not herpes, please help!