Amniocenteses tomorrow. Any advice?

Due to my baby being diagnosed with cleft lip/palate, I will do an amniocentesis to make sure there is not a serious genetic disease related. 
I did a Mateenity21 test and nothing was found. 
I'm so sad. This is my 3th child, my first baby boy, I prayed so much for this baby. 
This will be my 2nd amnio. 
Any advice? Support? Thank you.