Genetics, fertility treatments, or luck?

Mercedes • Mommy of one amazing little boy and girl and #3 on the way 😍
I want to know how you ended up with multiples! I would LOVE to have twins but I have no twins in my family. I have heard that some people end up with multiples after receiving fertility treatments but I want to know my chances without either of those things. 
What do you think is the reasoning behind yours? 

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