B.C.
I've known a few people who got pregnant after a doctor said it wasn't possible.
My boss and his wife tried IVF twice with no success and they decided to take a break from it - and got pregnant 2 months later.
Just when they thought maybe one child would be all they were going to have - they were pregnant again.
A co worker who'd had several children had trouble getting pregnant again and did IVF to have another child - which worked - and the doctor said she'd have to do IVF again if she wanted more.
Well she did get pregnant again just 3 months after having her IVF child - and it turned out to be twins.
Now for me - we couldn't get pregnant without help.
We did IVF to have our son,
We determined birth control was a waste of money - so we never bothered with it again - and we didn't get pregnant again.
It's possible - but there are so many factors involved - there's really no telling which it will be for you.