Im very OCD and stress and worry over stupid stuff!!! But I had sex on December 1 with one partner and received my period on December 14 and then received it again on january 14.. And had sex with a new partner on January, 27 & 28.... a 2 month difference I know! But I want to b positive that their is no possible way that it is partner 1's baby??????            
 
            Hi Starz,
If you had two normal periods, in Dec and Jan, then the guy on Dec 1 is NOT the father.