Is it wrong to feel the way I feel

My husband and I have had 3 miscarriages from 2019 to now. So for 3 years straight we have been dealing with this heartbreak. Except this time was different being I actually had to push this baby out. All the doctors keep saying each time is, it's something genetic. I want kids, my husband wants kids( he already have 9 years old twins). So im Starting to feel like if our genes together can't produce a successful pregnancy, what's next. I wouldn't want to be that barrier that's holding him back from being completely happy. And I feel the same about myself. Do I just settle the rest of my life being his kids stepmother and not having my own kids. My heart is literally broken..I feel like such a failure...