Me and my girlfriend were exploring our body parts. I had wore a condom when the first time my penis got erected but since we were not playing much at first my penis lost the erectness and the condom came out then again I wore the same condom and this time I started rubbing my penis in her vagina. I also inserted my tip a little bit in her vagina. But neither I cummed in her vagina nor in the condom. But I am not sure that when the condom came out at first instance, the outer skin of condom had any contact with my semen or any pre-cum. Is there any chance of my girlfriend getting pregnant? I am worried as this was the first time. Please help.