Hi, I am a 25 y/o female. A few days ago during sex I had very heavy bleeding. It was a constant a large amount during sex, which was immediately stopped then a constant "flow" for about 10 minutes. The next 15-20 minutes I was still bleeding but not as heavily. As the day went on I kept passing clots of blood- like I was on my period, but I am currently 2 weeks out of the onset of my period. I also passed a blood clot the next morning (this initially happened the day before around noon). I did call my doctor and went in for a pap, where she told me there looked like there were spots of blood on the inner perimeter of my cervix. She stated she would do lab work, check for STDs, and possibly send me to a specialist. I am about 99.9% certain it is not an STD as I am currently engaged and have been with the same partner for a little under 2 years. After my pap (Tuesday afternoon around 2) I had more bleeding that night, which I assumed was from the exam itself. This morning (Wednesday around 7 am) I passed another large clot of blood with a lot of dark mucus. I recently had an odd shooting pain in my left leg, kind of on the side of my shin (I don't know if this is relevant). I am 5'6'' and around 200 lb. I am currently taking Minastrin 24 FE birth control. I am anxious to hear back news from my doctor and was just trying to get all the information I can right now, so I can try to put my mind at ease. I don't want to stress about something that I don't actually need to stress about. I know with exams and lab work it takes awhile sometimes to get results, and with insurance referrals it might be a few weeks before I see a specialist.
What could be the cause of this?
Thank you for your help in advance.

Other information that might be relevent: I did have the HPV vaccination when I was a teenager. (around 17-18).
My mother was diagnosed with endometrial cancer around the age of 49-50, but had been displaying signs that went undiagnosed for about 5 years old patientprior.  Main sign was abnormal bleeding.