Everyone who gets their 1st dose is guaranteed to also receive the 2nd dose within the required time frame. This time frame may vary between first and second dose, depending on the vaccine: BioNTech/Pfizer 3-6 weeks, Moderna 3-6 weeks, Novavax (Nuvaxovid) 3-6 weeks, AstraZeneca (Vaxzevria) 4-8 weeks, and Johnson & Johnson /Janssen) 4-8 weeks. The 2nd dose, too, requires you to fill out the vaccination form, so that potential changes or comments since the 1st dose can be made.