edit: the number of side effects for some of these female contraceptives are staggering and many women aren't aware of the entire scope of possibilities. I suspect most women are affected and don't realize it, just accepting it as normal because their friends have the same issues.
I know this is anecdata, but I know two different young healthy women who suffered strokes or Deep Vein Thrombosis before the age of thirty because of Yaz. (Both fully recovered, thank God, but will never be able to take hormonal pills again for life.)
The cause/effect relationship between elevated estrogen levels and clotting disorders is well understood by physiologists. All the old high-estrogen contraceptive pills have been pulled, because the data shows that they were not safe.
I support women having easier access to birth control, but my point is that even today, this stuff has a different safety profile than, like, Pepto Bismol or Advil.
(But then again, so does Tylenol, and that's legal, so...)