Are you protected during placebo week before switching birth control pill brands?

Yes if. You are protected if you have been taking your birth control pill every day as directed and if you start the next pack at the appropriate time.
It depends on pill. Some oral contraceptive pills have a diminishing amount of hormone in the "placebo" pills. Make sure that is not the case, by continuing your present pill including "placebos" until you are ready to switch to the next brand at the appropriate end of the old pack to be safe from unintended pregnancy.

Related Questions

Is it normal to experience several days of extremely heavy menstrual flow with clots and flooding during the placebo week of the birth control pill

Timing yes amount no. That is the correct time to have your cycle while on birth control. Periods are usually a lot lighter on birth control. If this is a new pill it may take a few months. If this is a repitive pattern you may consider changing brands or methods. Read more...

Am I protected if I take phase 3 of my triphasic birth control pill twice, have a placebo week, and then start back with phase one to delay my period?

Initially, yes. You can safely delay your period while maintaining contraceptive effect by taking an extra week of phase three. However, It's possible that the effectiveness of the Pill will be lower in the both the next "short" cycle and the subsequent regular one. Altho I don't recommend it, if you choose to alter your pill regimen, use an additional barrier contraceptive for those next 2 cycles. Read more...

Is birth control pill still effective if you get your period at a time other than the placebo week?

Breakthrough bleedin. Breakthrough bleeding (bleeding at the wrong time) is very common on birth control. It happens in about 1/3 of users. Its no big deal and usually self corrects over time. If you are not satisfied or it continues to happen then consider using a different birth control method. It is a common side effect and does not mean something is wrong or that the pill is not working. Read more...