Pregnancy sac is not visible at 5.2 weeks [miscarriages] [progesterone]

Im so nervous now. I had a vaginal ultrasound and they could not otherwise if the pregnancy away. They said it is quite early to see it. There was some black thing that said they could bag, but it was not clear on the ultra sound.
My Beta on 12dpoiui was 69 and after two days was 214. My progesterone was 75 at 12dpoiui

I have 2 previous miscarriages. I have an echo on February 23.
Is it normal not to see sac early.
Please reply.

: confused:

The chance of a miscarriage? [miscarriages] [ultrasound]

I have a 3 year old son, but had four miscarriages before him. I am 5 weeks pregnant and again, but must wait nearly two weeks to come in for an ultrasound. The waiting is killing me, because I try not to get too excited about the fact that she is pregnant until I know for sure. Are my chances better for the implementation of these people now that I had a baby? All input is appreciated!