scared to have another stillbirth

I want a living baby so bad it hurts .. I lost my son Noah a few months ago at 26 weeks I had a picture perfect pregnancy and his little heart just stopped.. I'm in my second month of trying to conceive my 3rd... I have a healthy 6 year old.. and I am suspecting I might be pregnant but I'm still waiting until the day I miss my period to test .. I haven't even got a positive yet.. Having a baby is so important to me and my family and I will never try to replace my son but we want a living sibling for our daughter.. I'm terrified & overwhelmedwith emotions .. if anyone has gone through a similar loss how do you relax in a subsequent pregnancy... Now that I'm an angel mommy I keep hearing about people I know that are going through late losses and it really makes me feel that terrible and scared all over again... Having a baby is more important to me than my fears but I don't want to put my baby girl through another disappointment like that either .. I guess the point of this is that I'm scared and I need some tips on how to be strong..