Me and my Girlfriend had Intercourse for the first time. There was little pain entering the vigina but when i got about three inches in she was in alot of pain, she didn't want me to go any further because it hurt too much. I'm not sure if this is the hymen or not. The articles i've been reading say its at the very beginning of the vigina. I'm concerned it might be something more serious.
It was probably just her hymen, or she was really tight/dry. Just use lots of lube and go slowly next time. Foreplay is good too.