Is she prego........?

Me and my girlfriend were dry humping I was wearing basketball shorts and she was wearing pjs. I came and it soaked through my shorts and left two spots on her pjs waist line. She said she couldn't feel it on her skin. She slept in those pjs. She was also on her period with tampon in. Could she be pregnant? Update...she's still on period so is that a definite that she's not prego? I'm a worry wart...