What really cracks me up is the paranoia people have about the ingredients of vacinnes (not just the covid one), thinking a miniscule amount of some chemical in a vacinne is going to be toxic or cause some kind of chronic condition. Formaldehyde? Do you smoke or live in a house with plywood? Aluminum? Do you use underarm deodorant? Even mercury you are naturally exposed to more than what might be in a vacinne. People just don't realize the kind of exposure to chemicals they get every day. I'm not saying that the daily exposure is going to do any substantial harm, but vacinne ingredients should be the last of your concerns.
I know this isn't what the concern is regarding fertility, but it just another example of the stupidity. But regarding the fertility question, if the immune response were to attack the placenta because of the similar proteins as covid, then a natural covid infection would do the same thing, and we be screwed anyway.