Ugh i just dk

I'm suppose to be 7 weeks pregnant 2 days ago I started light bleeding with little blood clots like little dots of em but its been 3 days . My first OB appointment is Tuesday. When I woke up yesterday the ity bitty clots continued so I called the hospital to ask their advice. I was told to drink water all day and lay on my left side and if doesn't stop go to the er . It didnt so I did from 10:00pm to 8a.m. I was at the hospital to learn nothing. Initially the doctor told me "oh your levels aren't high enough to be 7 weeks your probably miscarrying or its ectopic" so they give me an ultrasound but tell me its not ectopic but they can't find anything at all in the ultrasound and it may be too small. And to just wait for my appointment so now. Im just lost. Intially when I tested i was still spotting so I dont even really expect to be 7 weeks. I really dont know what them finding nothing means ? And these tiny clots are so confusing. They really didn't show much concern just told me to wait for my appointment. Now im still lightly bleeding but the clots have stopped. Anyone experience this? Or have any suggestions on what they think it may be ? Infection? Miscarriage?