Thanks for the query,
It is evident by the history that she got pregnant in her December cycle and not in her November cycle ( when you both had sex) simply because december 7 urine pregnancy test was negative which should have been positive if the pregnancy would have occurred from sex on october 26th. So unlikely that you were the father of that pregnancy.
As the December period was missed and not the November, so it is evident that she got pregnant when she was out of country and the gestational sac was rightly corresponding to the period of gestation. Though it turned out to be an embryonic pregnancy and hence got aborted at home or maybe was aborted with medications.
You need to speak with your partner in detail about this situation.
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