Birth control pills: Leutinizing hormone (lh) and follical stimulating hormone (fsh) levels spike right in the middle (between periods) of your menstrual cycle. This spike causes your ovary to release an egg and also begins the process of building up the lining of your uterus in preparation for a fertilized egg to implant. Birth control pills prevent the mid-cycle spike in lh and fsh.
Answered 4/21/2013
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