What Causes Stomach Pain And Vaginal Bleeding Post Intercourse?

hey i have a question i had sex like three weeks ago and i suppose to came on my period on the tenth never did ok valentine day me and my spouse had sex stomach started hurting doing the process but never did come on but all of a sudden monday came which is today i started bleeding can you tell me what that sound like i took a test like two weeks ago said i wasnt preganct could it be too early for me to find out if im preganact