I know how that is ^^; I've gotten way off track before because I would schedule my next appointment before seeing if I could donate that day. Then, the times when I couldn't, I'd end up just waiting for the appointment date that I'd made going in. These days, I make sure to schedule my appointment after I find out if I can donate, so hopefully I'll be able to make my first gallon pin/shirt/whatever by the time I'm twenty-one.