Miscarriage: Last week I had my first U/S and baby was measuring way smaller than it should have,…

Miscarriage: Last week I had my first U/S and baby was measuring way smaller than it should have, but there was a strong HB. Went back today (7 days later) to check for growth and baby only grew 1-2 days worth and heart for only flickering once every few seconds :(. Waiting to get betas done so she can compare and I go back Monday to talk about our options. This is our first loss and would have been baby 3. ?