Can you get pregnant if you don't take the inactive pills on the pack?

Sometimes, yes: The tri-phasic and 20 microgram estrogen pill types of oral contraceptives previously had very little tolerance for missing pills and some of them actually had a very small dosage of hormones in the "inactive" pills to facilitate the ensuing period. Thus, if a patient did not take the "inactive" pills and did not immediately re-start the active pills "on time" pregnancy resulted.