Why did I faint and have severe bleeding after intercourse?

Hi doctor,

I am a 19-year-old female. My height is 5'1 feet, and my weight is 115 lbs. I had my menstruation nine months back that night. I had intercourse, and when I stood up, I slowly started falling to the ground; my eyes rolled behind my head, and my mouth was open. My vision and hearing went out, and my boyfriend yelled my name pretty loud multiple times, but I heard it once, the last time. Few of my family members said it could be a miscarriage, as my periods got delayed. That day, I was bleeding a lot more than usual. I had a gynecologist appointment today, but my mom said it was probably nothing and asked not to mention it. I am not satisfied. Kindly help.