You consider yourself regular as far as your period goes. And then one day it doesn't come as scheduled. You check the calendar to make sure you have the right dates. You don't worry so much the first couple of days but then as more time passes you wonder if you could be pregnant. So you buy one of those home pregnancy tests and it is negative. You are not pregnant but you still don't have your period. What gives?
This happened to me fairly recently. My cycle is usually...


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