Spotting

I’ve been having a lot of discharge and have been spotting some really dark brown stuff not a lot though. I been kinda moody lately and haven’t been tracking my period but I feel like it’s late and here it is end of July and I haven’t had it at all this month. I can’t remember how long ago I had it but I feel like if I can’t remember it was probably awhile ago. I took a test maybe 3 days ago to see if I was pregnant but it came out negative. Was that early? Should I take another test?