Nope. There's no way to tell unless you know exact dates and dates you had sex. Sorry :( even then it's a guess.
Well I mean I'll know I'm pretty sure cuz I'm white and one guy is Mexican and the other is black they both have distinct features so I'll know then I mean like before that
Get a DNA test when the baby is born. It's all you can do - there's no way to tell otherwise. Unless you know the exact day you ovulated (many women are irregular in that unless specifically tracking it).