New Young Mom, Terrified on what might happen

Hi ladies,

This is my first child, and my husband's 3rd, he has a two children from his previous marriage. Lately, she has not been happy he will be having another child since her child support payments may go down once baby is born, she has been threatening us saying she will be calling CPS for a wellness check up when the baby is born and get him taken away from us immediately, we have never given her a reason to do so, nor is there a reason to take our child, we are both working class people with steady financial income and a apartment, I am terrified she is going to do this to us and ruin my whole pregnancy and new mommyhood out of her spite and anger. Should I be worried?

TIA!!