See Days 1, 2, 3, 4, 5, 6
Sorry I've missed a few days.
We figured this out but it was confirmed by a diabetes educator. When inserting insulin pens, hold the pen in your skin for at least 10 seconds. The plunger needs 10 seconds to release completely. I usually try to add 10 seconds plus the amount of the shot if 10 units or less, so a total of 11-20 seconds.