I have not had a period in two months — I doubt that I'm pregnant since I don't feel that way. Could this be due to the one or two days I missed taking my pill? 
— Laura, Chicago
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Missing one or two days of active (non-placebo) pills in abirth control pill pack should not cause you to miss your period. Sometimes the hormone levels in the birth control pill are low enough that you actually do not bleed every cycle. If you had skipped an entire week of active pills or had recently lost a lot of weight, then those two situations might also cause you to miss a period.
Of course, it's important to get a pregnancy blood test to confirm that you aren’t pregnant — it is possible to be pregnant and not experience any of the typical symptoms, such as nausea and morning sickness. If you haven't had your period in three cycles in spite of a negative pregnancy test, see your gynecologist for further tests, including a sonogram and a pelvic examination.