My daughter, on her gynecologist's advice and prescription order, runs her birth control pills together; a 21-pill pack is followed immediately by the next 21-pill pack. There are no placebos, no breaks, so that she does not have a period at all at any time. This is becoming a relatively common practice to treat dysmenorrhea (severe menstrual cramps). The doctor prescribes as low a dose as possible that still keeps her from having any breakthrough bleeding. Usually severe menstrual cramps are treated by taking non-steroidal anti-inflammatory drugs such as ibuprofen or naprosyn (Aleve, Advil, etc.). However, my daughter can't take those drugs, so her only alternative to avoid those cramps is to not have a period in the first place. She is just now 18 and has been doing this for about 4 years.

However, I agree with the others that if you are combining just a couple of months' worth of pills together so that you are avoiding having periods only sporatically, you will probably mess up your cycle enough that you better be using another method of birth control at least once you stop taking the pills and before you've taken an entire month's worth again.

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Communication is the key.