Lol I like how idiots seem to think PP is only about abortions. My mom used to go when she was pregnant with me and couldn't afford to go to the hospital for stuff, while they deal with abortions, PP's major focus is general reproductive health care for people with low incomes or who lack health insurance. They also deal with contraception, which you may or may not be against. (in my experience anti-choicers are usually against measures that prevent pregnancy as well, but who knows, there's a lot of people out there)
I actually went there myself for birth control when I couldn't afford to go to the doctor, and my "times of the month" would cause me to pass out due to how extreme my blood loss was.
Regardless! Like everyone said, your money won't be going to PP, it will be going to the creator who allowed ads for revenue. Ads are normally there to get people to whatever is being advertised, advertisers don't make money off them unless you check out and/or consume whatever they're advertising. If I remember correctly you can also customize whatever ad-block does and doesn't blocks via their whitelist/blacklist.
Personally I don't blame you for using ad block, I'm not sure if it's been taken care of, but last time I had it off an ad redirected my screen and another lagged my computer to oblivion.