When did you start telling people?

My husband and I are just starting the process of IVF after over a year of trying and 3 rounds of failed IUI. I feel very overwhelmed, frustrated, angry, terrified, and deeply sad about all of this. I recently expressed to my husband that I want to tell my parents what has been going on and that we are starting IVF. He is against this and does not plan on telling his parents. He said things like “I don’t want to burden them” and “we can tell them when we have more answers or when we get pregnant.” He says he will support me in telling my parents but will not be telling his family. I understand his perspective in some regards. I don’t want to burden my family with this pain either but I feel like I am keeping a secret and could really use the extra support. Does anyone have any advice on sharing information outside of your relationship? Do you have regrets either way?