My Miscarriage -Possible Trigger-

I know a few of you know about my miscarriage but not my most, So I am going to explain everything here. About 2 and a half weeks ago I started bleeding and it was really light and I didn't think anything of it because I had just started my second trimester so I figured everything was okay and I didn't have to worry about miscarrying so I didn't call the doctor about it...Until Saturday when I got into the bathtub and started gushing blood and passing clots the size of 2 baseballs combined. I was in extreme pain by that point and so I went to the hospital. They put me on a ton of fluids ,did a pelvic examine and removed quite a few of the larger clots,and then did an ultrasound to see if I had passed the fetus and the uterine lining. I had passed the fetus and there was only a small amount of lining/blood/whatever all that stuff is left inside of my uterus so they decided I did not need a D & C. I came home and they put me on methergine and doxycyline to make my uterus continue to coontract and to stop my blood from thining so much. They thought I was going to need a blood transfusion from the loss of blood. I have been to my ObGyn 4 times since I miscarried to check my HCG levels to make sure they are continuing to lower. This experience has been very hard for me. I had decided that I did want to continue with my pregnancy and I was looking very forward to it. This was heartbreaking and is really hard for me to talk about. I just feel like you girls all helped me so much just by little things you have done or said when I was pregnant and I just wanted you all to know what had happened and why I may be a little depressed. I really do want to try and concieve again now. Although the pregnancy wasn't planned it also wasn't not planned so I just want to help fill this hole I have now inside of me. It is really tearing me apart. I know that it was just a fetus and wasn't a baby yet but it was MY fetus and I felt I had a bond with it. Now I feel very alone and needing that feeling to be replaced with happiness. I just don't understand things. I feel as if this was my fault even though I know it was not.
Sorry for the length