I think b also but if you ovulated early a could be the daddy so I would on the safe side let them both know you are pg and take things from there. It doesn't matter if a came inside there is still pre stuff and it only takes one. Best wishes to you. Good luck.
In my opinion with low HCG levels you are very early pregnant so I would say man B. If you had a HCG blood test done then they should tell you how far along you are that would help you figure it out. Good Luck.
Man B is the only probability, especially as you had a period after having sex with Man A. Not to mention how low your HCG levels were. Not to mention that you got a positive OPK and had sex when you had a positive OPK. And not to mention that you didn't get a positive until about 2 weeks after estimated ovulation time.
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