If there are those unexplainable fluctuation and they are significant, I always look at the last thing I have done. You mentioned the pod on your arm, which is unusual for you. It should not make a difference, I have them always on my upper arms and shoulders, but you could have hit a “bad spot” that is absorbing the insulin and kind of pockets it. It has not happened with a pod for me yet, but I remember with the use of syringes, hitting painful spots, spots that started to swell up with the injection material , spots into a vein and the injection was pretty much useless. I don’t think that the pod would tell you that but the moment you change it, look at the insertion needle to see if there is unusual blood on it. With the micro doses, you probably won’t see swelling of the site if the insulin is not absorbed. But this could be all “mechanical” reasons instead of illness, hormonal or the typical known issues.