It can be thrown off by things like stress/travel, so that's possible.
Here's this from the prescribing info: If the patient has not adhered to the prescribed dosing schedule (missed one or more active tablets or started taking them on a day later than she should have), consider the possibility of pregnancy at the time of the first missed period and take appropriate diagnostic measures.
If the patient has adhered to the prescribed regimen and misses two consecutive periods, rule out pregnancy.
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Date: 2011-11-17 07:43 am (UTC)Here's this from the prescribing info:
If the patient has not adhered to the prescribed dosing schedule (missed one or more active tablets or started taking them on a day later than she should have), consider the possibility of pregnancy at the time of the first missed period and take appropriate diagnostic measures.
If the patient has adhered to the prescribed regimen and misses two consecutive periods, rule out pregnancy.