How long before Microgestin 1/20 FE will take effect?By Cheryl from Reno, NV on August 10, 2007 Category: Microgestin 1/20 (Oral) Hello, I have just started taking Microgestin 1/20 FE for the very first time. How long do I need to wait until I know for sure that it will take effect, and not cause a pregnancy? Thank you! Cheryl |
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