Most folks do it on Monday, Wednesday, and Friday. Some switch it up if they have strange work schedules, or would rather be fluish on Sat, not Monday kinda stuff.

When I was on Betaseron, I used those gold star stickers on my calendar. when I did my shot, I got a gold star! or a horse sticker, or smily face sticker. If I looked at the calendar and no sticker was there, I knew I missed a shot.

Many good calendar programs on the computers, and cell phones now. You can set them to do a pop up on shot days.

3 years is long enough to know if the stuff was gonna work or not. I would have been surprised if she pulled you at 6 months, or even a year, but 3 is more than enough. Feel better!