Implantation information!

Kelsie
I've had irregular periods for about a year now, but they've been pretty consistent the past couple of months. I was suppose to start my period on march 29th, which I did have brown spotting but it never developed into a full period. 
I had spotting for about 5 days with cramps. Since I've stopped spotting, I've still had cramps (currently April 4th). 
All of my research has suggested I'm either in the early sign of pregnancy, or had a weird period. 
Has anyone else had an experience like this? Any help/advice is appreciated!