If estrogen is high you can get estrogen related side effects such as bloathing, headaches, breast tenderness. If estrogen is low you can get more frequent breakthrough bleeding, early periods etc.
The heaviness of a menstrual flow depends on the thickness of the lining of the uterus just before the onset of menses. The thicker the lining, the heavier the flow. In women using low-dose BCPs (for example: Ortho Novum, LoOvral, Ovcon, etc.), there is a tendency for the uterine lining to become very thin, over the course of many months. Clinically, this is reflected as lighter and lighter periods which may even stop completely.
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