Need some advice and well wishes. Slow rising hcg and low progesterone

I am currently pregnant with my rainbow baby after a loss in May at 12 weeks but things aren’t going so well. No symptoms but cramps. I should be almost 6 weeks. My hcg was 1590 Wednesday at noon and 2630 Friday morning. Progesterone low at 6. Saw sac on ultrasound Friday but no fetal pole. Doctor is concerned with my levels. Put on progesterone per my request today and drew another hcg. She said if they haven’t doubled or tripled to assume the worst and confirm with ultrasound. I know I should pray and stay positive but I am terrified. My fiancé says we are done trying if we lose another. I just want my baby to be okay. Any of you ladies had a similar situation and good outcome?🤞🌈