These are some links that I found while searching "the pill deaths, Puerto Rico."
They are not from sites that are opposed to the pill, or other birth control. In fact one of them is from a feminist webpage.
I post them because I find then to be ironic. They all discuss the high risk of illness and death for women if on the pill for extended periods of time, but none suggest that women do not use them.
They also discuss the controversial deaths of women used as test subjects for the pill in Puerto Rico, and how they have been prevented from happening again by lowering the doses of estrogen in the pill. What they do not mention is that by lowering the levels of estrogen to protect women, that is when the pill is less likely to have anovulatory effects, and breakthrough ovulation is more likely to occur.