What is going on?!

So my period is 3 days late, my period is usually regularish at about 35-38 day cycle it starts usually on or the day after glow days, well on my period start date, I started having this light brown discharge. I’ve had it before my period before but usually right after I notice it, my period starts. I only notice This light brown discharge when I wipe and it’s lasted 3 days now and still no period.? I’ve taken a test but it came out negative. I’ll probably try another one in the morning. Has this happened to anyone else and they were pregnant? Or am I out this month?

Thanks in advance!

Also, I have not had any of my usually PMS symptoms or any pregnancy symptoms other than an occasional twinge/cramp and some tiredness and bloating but I’m always tired😅

I also have had some headaches but I also always have headaches as well so I’m stumped!

It’s been 8 years since I’ve been pregnant so it’s hard to remember what happened😬