Not knowing gender VS knowing gender

First let me state I am 24 years old a mother of one little boy age 3. I am currently expecting my second child after many miscarriages. I have been through a lot of grieve and blaming myself for the miscarriages. I'm so very excited to be expecting a healthy baby, but I'm torn between knowing the sex of the baby. Me an my husband and my son all want a little girl, I'm anxious but think it would be even more exciting to not know. I was thinking of ways to find out but not from my doctor what the sex might be since me and my husband decided if this pregnancy didn't make it we would stop trying for a baby. We decided to stick to that decision bein this is my last pregnancy. Can anyone give me some special ways to find out from my mother in law what the sex is?