Is It Possible To Get Pregnant By Having Non Penetrative Sex During Period?

My Girlfriend and I were naked last night, I did put my penis inside her vagina. i ejaculated in the comfort room after that I wash it. Few mins later, i rub my penis in my girlfriend s vagina. Im worried because im not sure if i was my penis well, so, theres a possibilty that some semen remained in my penis. We did it during my girlfriend s 4th day of her period. Is there a possibility that she can pregnant?