My winter Jasmine has so far flowered from December on, but this year it started flowering in September and is currently in full bloom with full foliage. Will the flowering continue through to spring?
These things often happen, and it's been an unusual year weather wise, so it's probably just a bit out of sync. I wouldn't worry - you may find it stops flowering a little earlier than normal, or it may flower a bit less but for the normal length of time.
Enjoy it anyway!