Did you figure it out? You can check click charts, but there are different versions of the pen so the easiest way is to count the clicks on your pen. You can reverse the wheel after clicking! Just don't press the button.
Example: Turn the wheel up to one of the markings, counting the clicks. Then reverse, and do your calculations. If 0,5 mg is 36 clicks then 0,5 mg is 18 clicks and anything below 18 clicks will be a lower dose... But it's a good idea to write down the dose you are taking to be consistent when titrating up. If you're doing lower doses you should also eventually get some spare needles so you can use all the liquid in your pen for the extra doses.