I am a 19 year old girl. I is/was a virgin and has never had sexual intercourse. A day ago I met with a guy for casual mutual masturbation and I regretted it a lot. He claimed to be a virgin but I wanted to be safe and asked him to wear a condom for oral. I started doing handjob for him and he cummed some time after that. After washing up for about 5 minutes, he started performing oral on me with plastic sheet acting as a safety barrier. After about 10 minutes, the guy started fingering me slowly at first but got deeper and faster. I closed my eyes and asked him not to finger too deep but I had forgotten what happened as I kind of enjoyed it. The thing is, I requested not to have sex because I didn't want to lose my virginity or break my hymen.
After the session, I packed up and left the room. I didn't have any bleeding during or after the fingering. I had a nightmare the night hearing voices of people calling me a ****. When I woke up, I checked my underwear and was glad that I didn't bleed. On the afternoon, I was feeling unwell and noticed heavy bleeding on my underwear. I got a shock out of my life and wondered if it's due to me breaking my hymen or contracting STD from the mutual masturbation. I really didn't know what to do or what caused that to happen. I don't know if people can get diseases or STD from mutual masturbation.
I had fingered myself several times before this and hadn't noticed any bleeding. I regretted it so much as I didn't wish to lose my virginity to fingering or contract any diseases.