Best advice??

My hubby and I are trying for baby #4 going on 6 months now. A little about our past, we miscarried early on with our first, my son was born at 26 weeks after trying for 19 months. A year and half later tried for our 3rd and became pregnant in just 2 months. She was born at 22 weeks with Down syndrome and passed shortly after birth. I was then diagnosed with incompetent cervix and had a transabdominal cerclage placed in January. Now, here we are trying for baby #4. Any tips, tricks, advice?? Trying for our rainbow!