Miscarriage

I never thought this could or would happen to me.. my first pregnancy was easy as pie. No complications, normal birth.. she's now a happy, smart, energetic child. I found out I was pregnant July 3rd. Got positive test, blood work to confirm, set up all my appointments, and got my due date (march 11th) yesterday was a day from hell.. I woke up bleeding, and immediately went to the ER. They said I was having a possible miscarriage, they couldn't confirm it since being so early an ultrasound couldn't pick things up. I now know this is real for I'm still bleeding and now cramping today. Hubby keeps asking what we did wrong, but I don't know.. How long did your miscarriage last? I don't think we're gonna ttc very soon, since emotionally we're still a mess.. but how long after did you conceive again or ttc? This is so sad and scary.. I'm sorry for all the girls that had to go threw this