Fluctuations!?

I am 5wks 3d and I started heavy red spotting and cramping 2 days ago. I also lost all other pregnancy symptoms. The nausea, breast tenderness, ect. I was so sad as we want this baby despite it not being planned. I even called my mom up to hang with me for the day. But today no cramping, spotting older blood, and the nausea is building!! I dont know what to think. I am holding out hope, but still wary of miscarriage. I could do a blood test and another later to tell me if I am still preggers, but my insurance will not kick in until Jan 1st. If I need to I can go in, but what do you guys think? Should I also get an ultrasound at this point? Or just wait and see?