Opinions on using spemricides to reduce sperm count and sway pink please

Thanks!

I'm allergic to N9 and years back when I used a diaphragm, I had to use the one spermicide that was out there compatible w/ diaphragm use that did NOT contain it. I wonder if it's just as effective if I'm going to use it for swaying in the future...??? I guess if it worked in keeping me from getting PG back then when I was in my 20's, then it will do its job for swaying.