If your first baby was early was your second also?

Sarah • 27. Married. My son was born 2/22/16 and his little sister 7/5/17
My first baby was born at 37+5 days for no reason, other than he was ready-- now I'm pregnant again wondering if since he was early she will be also? Well, I actually know nothing is a given I guess I'm
More curious how many had an early first along with an early second, how common is it? I should also point out they'll only be 17 months apart... 

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