I was about to sex with my girlfriend on the 2nd of may I execute it too her vagina... but suddenly she had got sex too with another guy on may 4th and 8th and the guy said he execute inside my girlfriends vagina, but on June 11th,12th and 13th we contact again and have sex and I execute it too the vagina of my girlfriend. Is there probability that I was the Father of the baby.? Please help I was so confused who's the father among the two of us.. thanks

It could be either one of you since you both executed to her vagina. There is no way to know who the father is without doing a DNA test when the baby is born.