Spotting and cramping.

I’m 5 weeks 2 days and I’ve had some very light/brown/light brown/red spotting since last night off and on and cramping. Took another test tonight expecting the line to be more faint, thinking I’m miscarrying. But it is soooo much darker than a few days ago. I did play in a golf tournament all day yesterday and didn’t hydrate as much as I should have. Could this be causing cramps? The spotting has me concerned. Calling my doctor in the morning but could use some shared experiences or thoughts. Thanks!