What Causes Painful Intercourse?

Me and my fiance just got done having sex and it s been a few days since we had sex and normally I get tighter when we don t have sex after a few days and this time I was really loose I was told I had cysts on my ovaries there has been cervical cancer in the family cysts my sister head cysts but I ve been having a lot of pains that I ve never experienced before I know I m about to start my. But these are completely different pains it was painful during sex and he thinks I m cheating on him because I wasn t as tight and I was just wondering if everything that I previously described would have anything to do with why I was so loose this time