My wife was sick after her first (Pfizer). When they called her to come back for her second 3 weeks later, she went, but they wouldn't give it to her. (They said she wasn't in their system, even though they were the ones who had made the appointment!) Now, 8 weeks later (too late for the second one) they just called her and said she could come in for the second one again, (but she'd have to start over with the first one again, as too much time has passed!) Needless to say, she's skipping the whole thing and good riddance to it.