Odds of finding out gender...

Crystal • Mom to three(14 and 11 year Autistic twins),expecting number 4 in December 2018,and stepmom to two(14 and 14).

Baby's measuring small for it's dates.My OB is sending me to a perinatalogist.My appointment is 6/19/18.I will be 13weeks,5days.Has anyone found out the gender this early?