Can stress, vacation, and a change in sleeping pattern cause a period to be 5 days late even when on birth control or could i be pregnant?

What did you do...: ...On vacation? Yes stress or day/night changes or activity level changes (or illness or trauma, etc.) can cause change in menstrual cycle--either delay or missed menses not uncommon. You know one thing required to have pregnancy concern--if potential for egg to have met sperm, then yes, might be preg also & should check home preg test if worried.

Both possible: While stress can cause hormonal shifts you could also be pregnant even if taking oral contraceptives. Best to check a pregnancy test to be sure.