Hello, I would be happy to help you with your question.
At 4-5 weeks, I would not expect to see a fetus with a heartbeat (though dating based on sac size alone is inaccurate). At 5-6 weeks I would expect to see the development of a yolk sac
, but the fetus might still be hard to visualize. So from what you are saying, there is still hope.
You need a followup ultrasound
at the end of this coming week to further clarify. The comments about a "bulky" uterus
are not specific and they are not commenting about fibroids. Subchorionic hemorrhages are common but of low concern in the absence of bleeding or cramping.
I hope this helps. If you require more detail or a more prompt response, please use the Premium service. Good luck.