my period is late..

my husband and I have lost two babies to SUIDS (sudden unexplained infant death syndrome) *SIDS is basically the same thing (sudden infant death syndrome) our daughter North on January 12, 2015 and our son Dean April 4th 2018. We have a 5 year old name Leo and a 2 year old named Roman. This is the first time Ive actually been scared to be pregnant. I dont want to loose this baby too. We have sent off their slides from their autopsies and my husband and I have sent our blood *for DNA to a SUIDS/SIDS researcher from Harvard to see if there is a genetic factor somewhere.. but what should I do? I am literally freaking out and I am truly scared. Please someone calm my nerves or give me some advice and/or insight. I really need it.