The stabbing pain you are describing sounded really familiar - so a quick google brought up this...
Endometriosis
I'm guessing you're pretty young, but have you ever been to a GYN? Have a problem with painful periods?
Painful sexual intercourse
Or, in all honestly, it could just be your hymen being broken, he may not have broken it the first time. And the discomfort the first time was a result of not enough lubrication.
However, if you are sexual active, I would suggest going to a doctor for birth control options, and to just reassure yourself that you are OK.