Hi ladies

We're not TTCing, but since Sunday/Monday I've been having awful period like cramps, but no bleeding - I'm bout 3 days past the longest period I've had in the past 6 months and was wondering if anyone could help me out?
I am irritable, I do have sore boobs but I peed on an O test, and it came up with an extremely faint line. Now I know that doesn't mean anything but last time this happened, I was pg :\

Besides suggesting to get a HPT, any ideas?