Spotting - Brown, then red

Ke

I’m 6 weeks and had some light brown spotting last week that lasted 3 days. Yesterday I had some dark red watery blood, followed by a little spotting throughout the day. No clots or tissue and not filling a pad. No cramps, but did feel lightheaded and dizzy for a few hours after the initial red blood came out yesterday. My doctor is having me come in for HCG testing today and again Wednesday to make sure my levels are increasing. Anyone else experience something similar? What was your outcome?