The only problem with taking birth control pills non-stop (which probably doesn't pertain to the three-month thing) is that eventually you're body will decide to have a period anyway, and you may start to spot, and it may not go away until you go off the pills & have your period.
I went seven months without a period, taking pills in succession. My doctor said aside from the spotting thing, no other risks are apparent, as, unfortunately, (as with most womens issues) not enough studies have been done.
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