Am I less fertile?

I don't want to come off the wrong way. I am avoiding pregnancy and super about not having a baby right now. I am completely aware that it could happen and I take responsibility for that(disclaimer) however just a question. So many girls wind up pregnant from small mistakes in their bc method. And I am no saint when it comes to messing up on my method. Like last month my bf didn't pull out on time and I took plan b the next day and then let it happen a couple other times without taking the pill again.😞 but I was fine and af came just in time. However I can't say that was the first time i haven't been 100% on being super careful. (I've only taken plan b 3x in my life, I don't rely on it) we are pretty careful. Just not 100%. I'd say around 85%-90% perfect. However my friend just got pregnant from a one time thing, and this isn't the first friend that's happened to. And I am super happy it hasn't happened to me but it also makes me wonder, will it be more difficult for me years down the road when I am trying for one? Am I less fertile? Does fate have anything to do with it? Why am I so lucky? And will I be unlucky later in life? This might be irrational but I'm just curious and a little worried that I am maybe less fertile. My hubby really wants kids one day and it's always been a fear of mine that I won't be able to fulfill it.