Should I tell my new boyfriend I was pregnant and miscarried before I dated him?

Anonymous
A little over two months before I started dating my new boyfriend I was pregnant and miscarried by my ex from 5yrs ago. I am still friends with my ex we always have been and still talk occasionally. My boyfriend now have a mutual guy friend that knows that I was pregnant. I don't know if he will ever tell him? Is this something important to tell him? I know if anyone should it should be me.. to me its personal. I don't have any feelings whatsoever for my ex we have been friends for 10 years and have remained friends. My ex is still in love with me.. so I know I probably shouldn't be friends with him we just get along and I am not the type of person that thinks you can't be friends with an ex? I don't even think my new boyfriend know that I had a fling with him over the summer before I dated him? just confused if its important to say something or not?
Should I tell my new boyfriend I was pregnant and miscarried before I dated him?
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