In terms of preventing pregnancy, it's not a crucial step to always take your pill at the same time each day. The only exception: if you're taking the mini pill, a progestin-only birth control pill which must be taken at the same time every day. However, most women take the regular birth control pill, which contains a combination of estrogen and progestin, and are not time sensitive. You can miss a day and catch up while still being protected, so a few hours won't change the effectiveness.
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