Plz help!

Summer
Ladies plz help! My period was about 5 days late and I was just waiting it out to see if I got my period to not waist money on a test because it's never positive, but tonight I spotted a little bit and I didn't think anything of it. But then I thought I started me period because there was a little blood but when I went to the bathroom it was basically all brown like old blood. I'm so confused.  Should I still take a test or is it just my period? Has any one else experienced what I am and still been pregnant?