I have been taking Seasonale and Seasonique for 2 1/2 years now. I started with Seasonale and then they changed it to Seasonique a year ago.
For the most part, Seasonique doesn't reach the 84 day course as it should. Every trimester I take it, I start the break through bleeding around day 74. I never make it to day 84 to start the placebo pills (sugar pills (85-91) without spotting. Then I get my period. So basically I get a longer period, just very light at the beginning. Then it pretty much stops when I start a new pack.
So it's very annoying. I was trying to figure out why it does it. I read the ingredients, the pharmacokinetics and all that good stuff, and I think that what happens is that the hormones get lighter toward the end of the pack. Why else would I start spotting? Too much coincidence that it always happens toward the end.
When I have stopped taking birth control for several months and go back to it, I get break thru bleedings because my body is adjusting. But it shouldn't happen after continuous use. Well, at least now I know I am not the only one. And my libido does change when I'm on the pill.