13DPO all the symptoms and scared!

So I'm 13 DPO today, I tested on 9DPO and it was negative, so I decided that I was going to wait until I missed my period (due tomorrow).

I've been having waves of nausea for the past week, pinch on my left side, some very light headache since yesterday, blotted and I'm feeling very crampy. I spotted on 11DPO when cleaning, yesterday just once, and today is a every time i go to the bathroom and i clean it comes a little (all brown and on 11 DPO I had one pinkish spotting as well).

I'm very crampy, its not painful like menstrual cramps, but its moderate, I'm just worried that is the started of my period, what you think? Is it normal to be cramping and still spotting in early pregnancy? I will be testing Monday morning if tomorrow my period doesn't show.

(Test from 9 DPO)