I had sex with two men in the month of Aug and am unsure which guy is the father. My last period was Jul 31 or Aug 1 (not totally sure which day) had unprotected sex on Aug 4 then again on Aug 14. Took a plan B pill on Aug 16 and had a positive pregnancy test on Sept 1.

There is no way to tell until the child is born and you can have a paternity test done.

Sorry, this is far too close to know, conception and due dates are give or take a week or two at the very best.

You have no choice but to wait for the child o be born and do a DNA test