Is this spotting?

I had a chemical pregnancy last month, I’m now pregnant again (tests are much darker this time) but for just over a week I’ve had light brown discharge. My tests are getting darker and I feel like I have an infection (burning sensation and needing to pee more often). I can’t speak to a dr until Monday so does anyone have any advice on what I can do until then please? Would it make more sense that it’s an infection rather than another chemical? I’m worrying every day.