I’m in a tough spot, mentally

I’m 23 and married, as of 2017. I’ve been with my husband since 2014, and we’ve lived together since then as well. I have a stable job, so does he. We own a home two cars and have 4 dogs. My parents have always been a bit...over protective of me since I’m the “baby”. My husband has a son and well we’ve been trying recently. Thing is I think I might finally be pregnant! Yet I’m terrified of telling my parents because they’ve always put off a vibe that they are tired of raising grand babies (my sisters had 3, all of which they’ve raised). I know I won’t have them raise my baby but why do I feel so scared that I’m bringing in something THEY don’t seem to want even though me and my husband do??