Is it possible not knowing you were pregnant with twins and lost one. The thing is I had a healthy baby boy then three weeks later I had a miscarriage. No, it was not a new pregnancy. The one didn't make it but stayed inside the whole time and no one knew about it. It explain why I had so many problems during the pregnancy and almost lost my son and myself. I had multiple ultrasounds and even had my gallbladder taken out (it started to shut down around my 20th week). I was always sick and not with morning sickness. I am wondering is it something I did to make this happen? I knew I had a chance of having twins since it runs in my family (a lot of sets). The question I have is how in the world did they miss this?