Baby father confusion?

just discovered that i am pregnant..i've been sleeping with two guys both unprotected. they do not know about eachother. one guy i was with during my fertile days..and i've read that sperm live inside a woman for 3-5 days. the other guy i was with on my most fertile day. so i was with guy 1 then five days later guy 2..both came inside of me. i assume that guy 1 is the dad but would like to hear other opinions. who should i assume the father is?