Spotting

Okay, I need your guys thoughts. My last period was July 13th, so today I would be 6 weeks 6 days pregnant. This is my 3rd pregnancy, my first two both ended in miscarriage, the first at 12 weeks and the second at 7.5 weeks. My first miscarriage I had no idea I lost the pregnant until my ultrasound. The second pregnancy I started spotting brown blood, then progressed to red. Yesterday I started spotting brown blood, so naturally I freaked out because of my history. I emailed my doctor and she said to go get my labs drawn. I got a call today from the medical assistant and she said my HCG came back at 123,238 😳. She was adamant my last period had to be before July 13th, but I track everything and know when my last period was! I guess my concern is that I’m still spotting dark brown blood and have mild cramps. I’m also worried because one HCG doesn’t say much, I would need another one to see if the number is increasing or decreasing. Anyway, I have an ultrasound scheduled tomorrow now because of how high my number was, so fingers crossed.