I am very sorry for all that you and your husband have gone through, and I hope that you are able to comfort each other. You are asking very important questions, and perhaps this information can help to guide you both. Making a decision about trying again is very personal and depends upon a number of factors including recommendations from your doctor and when you are emotionally and physically ready to try again.
In the general population, there is a 3-5% chance with each pregnancy that there will be problem. These risks are increased if two partners or related or if there is known family history of a condition.
As you may know, Meckel syndrome is a severe condition which causes cysts in the kidney as well as problems in the central nervous system, liver fibrosis, postaxial polydactyly (having an extra finger), and an occipital encephalocele (this is a specific finding that involves the skull and the brain).
Meckel syndrome is an autosomal recessive condition. This means that both parents need to be carriers of this condition in order to have a child with Meckel syndrome. If two parents are carriers, then there is a 25% chance with each pregnancy that the pregnancy will be affected with Meckel syndrome.
I encourage you to meet with a genetic counselor who will review your specific situation and discuss options for future pregnancies. Some people in your situation pursue carrier testing for Meckel syndrome. Depending on those test results, it may be possible to have prenatal diagnosis for other pregnancies, if you choose. Some people in your situation do not choose to have testing. A genetic counselor can review all of these options with you and as well as discuss if the diagnosis of Meckel was confirmed in this recent pregnancy. To provide information about the chances that this may happen in the future depends on the certainty of the diagnosis. You can find a genetic counselor through the National Society of Genetic Counselors (NSGC) website.