So, I had been following a 1200 cal diet

And 10 days ago I decided to slowly increase for a "reverse" diet. Well, now it seems I am losing weight but I am not done with my "diet"
Should I continue until I get to maintenence or just stick with where I am and see how it goes?

It's hard to say without more info but assuming you went from 1200 to another deficit calorie level, you can do whichever you like. If you increased to a non-deficit level, your losses will stop. Sometimes our losses one week are from what we've done in the past month moreso than the past week or few days, so it's hard to attribute them to a particular calorie level.

In general, the lower the calories, the faster the losses. Changing things up can definitely break a plateau, and choosing shallower deficits can definitely increase patience and compliance, though.

Good luck!