How can I figure out who the father is other than gettin a paternity test

I'm young and I know I've made a huge mistake so I would like if people wouldn't criticize or judge me , bt however I had sex with 2 boys within a couple of day one was on Dec. 11th and the other was on Dec. 15. I didn't use protect with neither one of the and the only one tht came inside of me was guy #2 my LMP was on Dec.3 and my ovulation didn't start until the 12-17 of Dec. How can I figure out who the father is other than gettin a paternity test I'm currently 23weeks and due September 9th