Bleeding but not on period! Help!

My period ended September 17th. I usually have a very normal period, coming every month for 4 days.

On Thursday I had sex with my boyfriend and we used a new condom that was a “warming” one and it was very hot and made me feel uncomfortable after sex but after a few minutes I was fine. Yesterday, I experienced very little spotting once with no abdominal pain. It was bright red, but after that one spot, nothing occurred for the rest of the day. Today, I did not have any spotting in the morning or any other issues. However, I had sex with my boyfriend and we noticed there was a considerable large amount of bright red blood afterwards. I do not feel any pain and there was no bleeding before or after.

Does anyone know what this might be from?