Had a scan today and it's inconclusive

They have taken bloods and I've to go back on wednesday for more bloods as the pregnyl will make me look pregnant even though I might not be.
I just don't know what to think. The spotting became a light bleed on sat and sun then is back to spotting again. The lining of the uterus is thinner than they would expect but given the constant spotting they said that may be normal. No sign of a sac but they said I'm only just 6weeks so that could be normal too. Don't know if it is normal or not to not see anything at 6weeks. I am just 6wks.
Feel so drained today, and am taking the day off work. If I sit down the bleeding is less when I'm moving around doing stuff the bleeding gets slightly heavier. My head is telling me it's all over but my heart is still hoping.