Scared and waiting to miscarry - any advice on what to do?

Yesterday I had my second doctor’s visit to see the growth and progress of my little. The first visit we were able to see the embryonic sac, view of heart beat, and measure baby for due date 10/10/20. The only scary news was that we couldn’t hear the heartbeat. At this point, the doctor said it to worry and we will check I again the following week. I just had my second ultrasound yesterday. We heard the heartbeat! But, despite hearing the heartbeat, I didn’t receive comforting news...the due date was pushed back again to 10/15/20, and I measured to be gestational 6.1 weeks pregnant (WTE estimate says I’m 7.5). The doctor was also concerned with the pace of the heartbeat and told me that the likelihood of miscarriage within the next couple of weeks is very high. We couldn’t tell if the heart beat was a faint 114 bpm or strong 55bmp. Either rate is super low.

Any mama’s out there with a similar experience in the now or in the past? Is there anything I can do to save my little? How did you cope with waiting for the inevitable?