Low blood sugar

Lisa • Mom of 4 boys and one baby girl. Mom of a high-school graduate, preschooler in heaven, 3 year old twins and a 1 year old princess.
I just started insulin this morning and after lunch I started shaking so I checked my sugar and it was 69. I don't see my dr until Thursday but should I call them to let them know it got low? Or should I just tell them on Thursday? First time having a low reading so I'm not sure if I should be concerned or not.