Can i get the 2nd hepatitis b shot after 2 weeks of getting my 1st hepatitis b shot? if not, how long do i have to wait?

Yes: An accelerated vaccine schedule for hepatitis b is at days 0, 7, 21-28, and then 12 months later. This is good for travel or if you are not sure you can come back at week 4. Otherwise, wait until week 4, then come back for your third vaccine at month 6. Most people respond to this series. Remember, 1 -2 vaccinations are better than none, but not as good as following the full schedule.