New baby sibling

So today, I talked to my 3 year old about having another sibling. He loves the idea that he may get a little sister because he already has a 1 year old brother. But I had a lot of complications with both my sons pregnancies and with my last pregnancy they told me that my uterus is too think and my next pregnancy would be way too risky and I'd be on bed rest the whole pregnancy. I want another baby so bad. I want a girl. But I don't want to die or an innocent unborn child to die. They said I could possibly try in 3 or 4 more years but I'm getting anxious. I want a baby now. My boys would love another sibling. I need advice... I've already lost 5 babies in womb before I had my first child...