Hard to guess: Taking emergency contraceptive pills (such as i-Pill or Plan-B) can alter the timing of the current menstrual cycle and the upcoming cycle. One should check a urine pregnancy 3 weeks after taking an emergency contraceptive pill. If one's menstrual cycle was regular before this, one can wait for it to return to being regular... but it sometimes may take weeks.
Answered 7/5/2019
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