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A 28-year-old female asked:

I've had the implanon in for 1.5 years. i didn't get a full period until now. has it weakened to the point to worry about getting pregnant?

1 doctor answer3 doctors weighed in
Dr. J Ricardo Loret De Mola
Fertility Medicine 34 years experience
No: The implant is over 99 per cent effective, which means less than one in 1, 000 women using it over three years will become pregnant. It last for 3 years and its still active for you, even if you are having menses.
Last updated May 13, 2013

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