I just don't understand..

I found out on the 25th that I was having a miscarriage. It was my second pregnancy. A little backstory: I have birth to a beautiful baby girl in Nov of 2015. She was born with Congenital Femoral Deficiency and Fibular Hemimelia which means her femur bone and her fibula bone are missing (left leg). Her leg is about half the length of her other one, all you see is her knee to her foot. We've been to see a specialist who will perform a complicated surgery to basically turn her leg and foot around so her heel will act as her knee joint. She's the light of my life and I'm so lucky to have her but her condition is stressful and scary (also very expensive). I've always had some worry that if I had another baby it would have the same condition. Don't get me wrong, I'm in love with my daughter and she's absolutely amazing but if my husband and I don't have to go through it again, I'd rather we didn't have to. Anyway, when I took a pregnancy test and got my BFP I was overjoyed. I planned to do some cute announcement for my husband when he got home but ended up just calling him at work because I couldn't wait to tell him. Everything was going smoothly until the fear and the anxiety set in. I became paranoid that I would eat, drink, do, touch or smell something that would harm the baby. I tried so hard to put it out of my mind and just enjoy my pregnancy but I couldn't. Despite being told by my daughter's surgeon that her condition is random and it was nothing I did, I still blame myself to this day. Now, here I am, two days after discovering I lost my baby and sometimes I don't wanna get out of bed. I feel in my heart that I did something wrong and it was probably all the worrying and stressing. I feel guilty that I didn't do better, try harder and learn to calm down. I feel guilty that my husband suffered this loss as well and probably by my hand. I don't know what to do now. I feel empty. I feel guilty. I cannot shake the thoughts of Why? What did I do wrong? I only hope, with each passing day, that I'll be able to breathe again. Sorry this is so long. Just needed to vent.