Why am I bleeding during /? This has never happened to me, why is it now?

Last night I had with a new partner and I bled during, as well as after . He is much larger than the the men I'm usually with by almost 2 inches. I have been ually active for the last 10 years and bleeding during has never happened to me. The blood was bright red in color so I stopped, cleaned up, and went at it again. The bleeding had appeared to have stopped and I wasn't in pain, so I didn't worry and continued having for another hour or so. Then I got worried this morning because there is still some blood in my l discharge. The discharge is normal, doesn't smell, doesn't burn, doesn't itch. Just regular discharge that I always have, not much. Just has some pinkish blood in it today. Still no pain. I am not due for my period for two more weeks, we used condoms, I am not on birth control, and if it makes a difference I had a failed pregnancy last august at 17 weeks. Also I was not using lubricant because I don't need it, I am never dry. I am in my mid 20's so it's not a menopause problem. I was checked last summer for STD's and was clean. I haven't been tested this year, but have participated in safe only so it's not really a possibility that I have an STD. I was definitely in the mood, mentally and physically. So what's the problem and should I go to the gyno?