How Can I Determine The Father Of My Baby Given Unprotected Sex With Two Partners Around The Time Of Conception?

Good day I will go straight to the point.. I am 27 years old and i had a unprotected sex with two guys(Rendon guy and boyfriend) ...My last periods were on the 12th of September and i slept with the first guy on the 3rd of October and took morning after pill on th 5th of October then slept with the second guy (Boyfriend) on the 10th of October and i did not get my periods the day i was expecting them so i took pregnancy test and it was negative.. So i waited for 3weeks(3 weeks.. including the week i was expecting my periods) to test again and i was pregnant.... Now.. i do not know who is the father... Is it the first guy or the second guys please help. Thank you