Ok,
Well I am not that far away from you. I don't think it is that Unusual, I was looking at some Rosemary this afternoon and they had flowers. We have had a very mild autumn, they say it might be the wettest on record. We have not been anywhere near a frost yet, so it is not surprising. They are a hardy species, and will survive the winter we have no problem. It may be that when you potted out of season that it decided that it had better flower before it died. No, it should be ok, but try to keep to spring for re potting.
Geoff.