Help!

J
Originally due 10/17/15(19w 6d)but after yesterday's anatomy ultrasound,my baby is growing a week ahead(20w 4d) so putting due date now at 10/12/15 possibly,the only problem with that is,my husbands nephew was born the 13th!! I cannot have my baby the same day or even close to his birthday,his family will want to do there birthdays together and stuff like that,no my baby is his own person!! How do I get labor going faster or even slower so he can come out later if anything? I really hope this baby pops out atleast a week before !