Can I get pregnant


I've been married for 10 years & we've never even thought about having kids. I've never taken birth control in my life, never been cum inside of. We've always used condoms or pull out as preventive measures to not get pregnant. I also have heavy secretions when ovulating, so I've always known when I was ovulating & avoided sex for a few days. We're thinking we're getting old & want to start trying to have kids....we both fairly healthy, no major health issues.... but the fact that I've never gotten pregnant yet by accident kind of makes me think I may not be able to. Any thoughts?? Or does everyone else who gets pregnant "accidentally" just not take as good of preventive measure as they think they do???