Don't skip your morning dose. Just take whatever dose you took today and carry on with your usual dose tomorrow. Let your doctor know what happened on Monday and how you felt on the extra prednisone.

I think many people have problems tapering lower than 7 mg.

Speaking from my own personal experience, the 7 mg dose is a tough dose to get past. I think adrenal insufficiency was most of my problem. After I transitioned to a medication that wasn't prednisone and didn't suppress my adrenal function, I blew right past 7 mg. However, it wasn't possible to confirm secondary adrenal insufficiency and a low cortisol level until I reached 3 mg of prednisone.