I did some research as well and also found that the chances of crossbreeding were nil. But since I have the swordtail, the mollie, two catfish and an algae eater in the tank, there doesn't seem to be any explanation. I have had all the fish for over a year now. So unless she can impregnant herself(which I gather some species of fish can) or hold sperm for a long time, the Molly seems to be the culprit! Especially since she is pregnant again.
Thanks for your insight!
M

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