Genetic testing

My daughter was born with a large brain tumor which there was no cure for. She passed a week after being born. The same day I found out something was wrong was the same day she was born at 38 weeks.

I am pregnant with my rainbow baby and my doctor said she wants me to see a genetic counselor and technically I’ll be high risk pregnancy . Any idea what kind of test they would do ?? I’ve never seen a genetic counselor before

*also I’ve never had history of anything happening like this in my family, hospital said it was a freak thing that happened ( 1 in 10 million actually) but my doctor wants to make sure