condom slips a little

So me and my gf were having sex. She was on period at that moment, so it'll be a little safer if we had sexual intercourse, but it was down to her 6 day of her period, but there's still little bleeding occur, cause she checked before having sex. Plus, i'm wearing a condom. So halfway when i wanted to change position, i realised my condom rolled upwards, by just a little. The condom was still on, i didn't cum yet, but i guess there's still precum there. Although the condom was tight, i rolled it down back and continue to have sex. I ejaculated outside her and the condom was still on. I also checked the condom by filling it with water and it doesn't leaked out. So I'm just super worried if the condom rolls upward and maybe some semen leaked out from the bottom? Plus she was on top of me, so i'm scared when we're having sex, the condom rolls upwards, and she was on top of me, can the semen leaked out from the bottom? And likely, is she pregnant?! Cause it was still on her period i guess, on her 6th day and there's still minor bleeding. Help me please I'm worried, and my gf had been over thinking lately, help me please!