But the risk of ischemic stroke is still tiny, and the risk of stroke (among many, many other things) is still much higher during pregnancy, which birth control

But the risk of ischemic stroke is still tiny, and the risk of stroke (among many, many other things) is still much higher during pregnancy, which birth control, obviously, helps to prevent. In fact, for a sexually active and fertile woman, birth control will help lower the risk of ischemic stroke, overall. There are plenty of other OTC medicines which are far more dangerous than birth control. Tylenol, cough syrup, Bronkaid/sudafed/ephedrine, benadryl... Aspirin alone causes thousands of (some sources say more than 10,000) deaths a year. Birth control carries a relatively small risk of problems (especially for non-smokers and/or women under 35), but has a much larger benefit. And the copper IUD does not, strictly speaking, increase the risk of ectopic pregnancy. It's a matter of survivorship bias. They prevent pregnancies from occurring, but are slightly more effective for pregnancies that implant inside the uterus. 2% of all pregnancies (without an IUD) are ectopic. If a woman does get pregnant with an IUD, she is more likely to have the type of pregnancy that the copper IUD is less effective at preventing -- an ectopic pregnancy (According to Wikipedia, 3-4% of all pregnancies that occur with an IUD are ectopic). However, overall, comparing sexually active fertile women with IUDs and without IUDs, the IUD drastically prevents ectopic pregnancies, and, of course, pregnancies in general.