Why am I cramping?

Ok so I had what I think was my period February 24-27. The 24th it was light, the 25th was just spotting (only wore panty liner to avoid anything on panties) then the 26th and 27th I only had spotting when I would use the bathroom. Around March 1-2 I started cramping, felt like ovulation cramps, but they have continued. The first day or 2 they felt like bad period cramps. They kind of come and go and also have lower back pain. I haven't taken a pregnancy test, after 10 months ttc I've pretty much convinced it would be negative. Anyone had these same issues? If so, what caused them and how did you remedy it?