light pink discharge and then light brown discharge?

I have no idea what to think of this. I had sex on the 10th. My cycles are usually 30-32 days long and 7 days. Last cycle it was 42 days and only lasted 3 days and it was super light. Ever since I’ve been having sex with this guy, my cycles have been off. I took a test last month when I was 5 days late and it was negative. My blood test came back 0.60 but she also didn’t get much blood out of me either. I’m now 9-11 days late this cycle. Wednesday when I wiped, I had very light pink discharge and that was it. Yesterday I had light brown discharge when I wiped and that was it. Today, nothing. I’m scared to go buy a test for the result to say either negative or positive.