hey there Clover, welcome to the forum. The deeper you are in ketosis, the more fat you apparently will burn. Because you are in trace amounts, perhaps you may want to check to see if you are consuming less than say, 25g of carbs, as well as, that you are taking in enough fat with your protein.

I must say that my recent experience with ketostix is that I've only been in trace amounts. However, I have been losing fat! So I'm no longer worked up about the sticks. I'd rather spend time ensuring that I'm doing the right things.
Good luck to you!