Getting lab work for down syndrome screen!

Karina
This pregnancy was a total surprise to us as we had been on BC over one year. Our kids are 22, 16 and 9! 
Well i found out i was 7 weeks 5 days after my 40th birthday. I am 15 weeks now and I am so nervous about this pregnancy
Has anybody gon through with all the screening and have had a healthy baby at this age? I am seriously nervous!!