Can the plan b pill make you infertile?

It's probably a dumb question but I haven't got pregnant in about a year or a little bit more over a year. I haven't had any kids yet and I started using birth control pills when I was 20 but only use them for a few months. I have taken 2 plan b pills in my life but I don't know why I think I can't become pregnant. Sometimes we use protection and sometimes we don't.