Low Heartbeat

Hey y'all! So I went for my first ultrasound today. I'm 5ish weeks according to the scan. The doctor said they could see the heartbeat but it wasn't strong enough for them to feel comfortable. The doctor talked about my progesterone levels and did lab work to see if they were low or needed supplementation. She did prepare me for possible miscarriage....

They are wanting to do another scan in 2 weeks..

This is my first pregnancy and this news has just destroyed me. Has anyone had this happen before and what kind of outcomes did you have?