freaking out!!

So today I had my first ultrasound, doc saw 3 sacs ,one the sac that measured 6weeks with a yolk sac but we didn't see a baby, the 2nd sac seem to be a cyst of some sort in my uterus,the 3rd she thinks might be some kinda fluid but isn't sure. So I have to have my hormones checked, and I have to have a special Ultrasound done. This was suppose to be my rainbow baby and I'm completely freaked...my 4 year old son was so excited to be there and see his baby. Has this happen to anyone and the outcome was good? is it normal to not see a baby yet?