TTC and anxious

So, my hubby and I are TTC. We have two beautiful boys 5 and 3 years old respectively. I have always wanted a third but it took a little convincing for him. Now he’s on board but my anxiety level is crazy high because I’m worried about what my mother-in-law is going to be like if we succeed (we haven’t mentioned we’re even trying). She has always been overbearing and judgmental. A very “if you’re not doing it my way you’re doing it wrong” kind of person. She’s totally against my current SAHM status even though I have told her how important it is to me to be at home while they are young. I’m certain she is going to have something to say about how we don’t need to have another one (she only had 2) and I just get so tired of constantly being put down for my parenting and our decisions.

Idk what anyone can really do to help on this subject. I guess I’m just looking for a safe place to vent my frustrations and anxieties to hopefully relieve them some. If anyone has any advice on how to possibly handle this situation I’m all ears. Lol