question!

I know nobody on here is a doctor and can't really tell me much but I'm just looking for similar situations! Last week I had brown spotting for 2 days and then a tad bit of very light bleeding for one day and back to brown spotting for 2 more days...not at all a normal cycle for me...but I'm still having mild cramping in my lower abdomen and back...I took a test on Friday but of course it was negative...any body relate to this at all?