You never saw a lockup but did you see courting behavior when the albino was in there? Was there any courting behavior with the other male 9 months ago? Did she become gravid back then?

I still think the chances aren't very good that the father of this litter is from the first male. Of course, there's always a chance that perhaps a few of them were sired by the first male but I would have doubts that they all are if you saw courting from the albino male.

I saw a lot of serious courting for a lot of days with Miss Piggy and Flicker. I also didn't see a lock up but I am seeing some seriously convincing signs that she is gravid. With northwesterns there's a pretty good chance that not all the babies will be his, but certainly the majority of them should be.