I believe Sex Ed sets unrealistic fears of the chances of becoming pregnant when having unprotected sex. Thoughts?

I know that every womans body is different. I totally understand that. What I'm trying to get at is that, throughout childhood, what it seems we're taught is that you have unprotected sex once you'll be pregnant. (I understand that that is totally possible). But we were taught that in a way that made it seem. Every time, everyone, everywhere. YOU WILL GET PREGNANT IF THE PENIS ENTERS YOUR BODY WITH NO PROTECTION. 
Again i totally understand that is possible. But it seems as kids and teens we're told that, that is and always is the result. That pregnancy is strangely easy and quick and will happen every time you have unprotected sex. 
But through my experience with other woman and forums like this. (And ofc common sense) its very apparent that pregnancy is not as easy of a thing that the scare tactics of sex ed made it seem to be. 
I think thats something that should be taught differently in sex ed. That kids shouldnt be made to believe that pregnancy is so easy. That is can actually be extremely difficult. And for a lot of people it takes quite a few trys to get pregnant. Its very common. 
Its good to teach how sex works, how the sperm travel, how they get to their goal of reaching the egg. 
But every class I ever took. It was made out to be, that the sperm will practically crawl its way from your knee to reach the egg and will ALWAYS reach the egg and will ALWAYS get you pregnant when in the act of unprotected sex. 
I in no way am being an advocate for unprotected sex. But for people to be taught more realistic expectations of pregnancy and how easily it can happen/how difficult it can actually be. And that not every single time anyone has unprotected sex that they will end up bearing a child. It seems most sex ed classes use this scare tactic and end up creating unrealistic fears while we grow up, and we continue to believe in to adulthood.
Or a fear that somethings wrong with your lady bits when you dont get pregnant the first time you have unprotected sex and are TTC. 
Does anyone understand what I'm getting at? And do you agree? Whats your thoughts?
Thanks :)