Miscarriage after heartbeat?

I’m almost 8 full weeks and started off with a lot of cramping/no symptoms. Blood work levels weren’t doubling at first so we went for the ultrasound around 6 weeks. Despite the smaller size our little peanut had a heartbeat so the doctor seemed satisfied and said she wasn’t worried anymore because of that. A couple days later I got hit with the morning sickness and the cramping backed off so all seemed normal.

For the past three days the morning sickness has dropped significantly and the cramping is starting to come back. I haven’t spotted at all, but I’m really starting to worry. We won’t see the doctor until next week.

Has anyone lost their little sunshine after a strong heartbeat or seen drastic drops in symptoms like this? First timer in need of some peace of mind and help with understanding what could be going on... 😔