With oral Birth Control, when you are taking it for the first time, you should start taking it on the first day of your period. It will regulate your hormones, so that you should expect to have some sort of period during the week you take a break (if that's the sort of pill you are on). I am not familiar with the kinds of pills that are taken everyday, so I can't answer for those ones.
With the first kind, which I was on for eight years, you should also take the following precautions: Take it at roughly the same time every day, this will get you into a good habit of remembering to take it, say, after you brush your teeth, or when you get up. If you are late taking it, still take the pill, but not if it's the next morning as you shouldn't take a double dose.
If you:
Vomit or have diarrhea within 2 hours of taking the pill
Are on antibiotics while taking the pill
Are more than 12 hours late in taking the pill
These situations will mean that you are not protected, and in any of these cases you should also use condoms for seven days after the situaion has resolved,
i.e. tummy upsets (use condoms while you are sick and for seven days after you have recovered)
antibiotics (use condoms while you are on the medication and for seven days after you finish your course of medicine)
more than 12 hours late/miss a dose (use condoms for seven days AFTER you miss the dose, e.g. are late or miss it on Tuesday, use condoms from Wednesday to Tuesday AFTERWARDS)
Hope this helps, i know it's more than you asked for!
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