Ladies advice needed, empty Gestational sac 7 weeks

I am so heartbroken. So I had a miscarriage in July at 3 1/2 weeks. Dr told me to wait 1 cycle and then we could TTC again. My first period after my MC was 4 days late, started on August 13. So we started TTC again & I was convinced I was out because all my negative hpts. Then on CD28 I got my bfp, but I'm not sure when I ovulated I didn't test & I know for a fact my MC threw the previous cycle off. So I don't know if AF would've been due CD28 or CD32 etc. today I had my first scan at approx 7w1d and there's only a gestational sac, nothing else. & my sac is measuring 6 weeks not 7. They are sending me for bloodwork & I have another scan in 2 weeks then we will see what my next step is but the dr is pretty certain the pregnancy is non-viable & that I will MC again.

Anyone have experience with anything like this?