@Leon Said
Yeah, I suppose just using a condom for the entire 7 days of placebos regardless of the length of the period is best, just to be safe. And thanks for the heads up about antibiotics. Didn't know that. That's probably stuff the doctor should reveal if she were to get put on antibioitics, because they always ask if you're on any medication before prescribing anything to look for counterindications like that.
I also ask the question of whether or not to use a condom in the first few days once starting the 21 cycle over again, because I do know you have to use them a week in when she uses them for the first time (if she started midcycle).
I can only speak for here but here doctors do not tell you anything about your meds. They just prescribe your meds. Most doctors here have no idea if it interferes with your other meds, the side effects, what the pills look like etc. Here when your gets your meds its the pharmacist that looks up if you can take that prescription or not, if it interferes with your meds or not and tells you how to take the pills and puts the stickers on the bottles as to if you need food with the pills or not etc.
I an not sure if I am understanding your question or not, if she just started birth control, another means of birth control it condoms should be used for the first month. After that, its not necessary to use condoms unless on a medication that makes them less effective but one can still get pregnant by being on the pill due to many factors so if one wants to 100% avoid a preganancy they say use condom and birth control. Even something as not taking it the same time every day can make it less effective.