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Dear Anna:
Failure to bleed is a common effect of the birth control pill and is more frequent the longer one uses the formulation. When this happens, patients are asked to take a pregnancy test: if the serum test is normal at the end of the "placebo pill week", the next pill package is started.
There are old data that raised concerns about oral contraception use and harm to early fetal development: these data are being questioned. If there is harm, it is uncommon.
Keywords: missed period on birth control pill
This information is provided for education purposes and is not a medical consultation. If you have specific questions, please speak with your physician.