How long does it bear birth control to be decisive after switching brands?

my gyn is mailing me a untried prescription for birth control, so i was wondering if it take a month to be effective since its a modern brand? or does it work right away? It depends on if there will be a break between the pills. If you start the spanking new brand at the time you should've started the old one, you should be fine.
I would still use a condom for a few weeks, though. That agency you can make sure your body adjust well.
as long in attendance is no gap within time from your first brand to your second. you should be ok. however, i wouldnt take any likelihood and would use condoms for the next couple of months freshly in crust.