Hello, so i am 18 weeks and some days pregnant right now, and based on my LMP which was on May 12th and first trimester ultrasound , I was given a conception date of May 26. Only problem is I had been having unprotected sex with guy throughout the whole beginning of May and he had ecjaculated in me ealier that week on May 21st. I had a random one night stand with guy #2 on May 26 but we used a condom and when i asked him if he took it off or if it broke, he assured me it didnt. I know they say 1st trimester ultrasounds are pretty accurate and are off only about a week and that sperm can live in the vagina for a max of 5 days. Based on that information, what are the chances that the baby is guy 1's?