I have nearly a whole box of Advanced Digital test sticks left from last month. Decided to invest in the Advanced Fertility Monitor to up my testing game this month but the one I bought didn't come with any sticks. The internet pics of the sticks look basically identical but can't find and info on whether you can use these sticks in the advanced fertility test gadget and whether they're interchangable. Has anyone tried? Do they work? I'm loathed to spend another £30 on test sticks if it turns out they're exactly the same.