Late period and discharge

I’m 4 days late. 2 days ago I took a pregnancy test and it was negative. Yesterday morning after I wiped there was some light pink spotting and no more bleeding after that. Tonight there’s some dark brown spotting when I wipe. Could this be my period starting?? If I don’t start by tomorrow I think I’ll take another test. Anyone else experience this? I’m never late. I’ve been feeling absolutely terrible for 2 weeks now. Cramping for days and I threw up last night. A lot of pregnancy signs are similar to PMS so I’m not sure. I’m just worried and trying not to get overwhelmed.