Symptoms of going off pill? Please help!

I just stopped taking the pill, but to be honest I've never taken it consistently but now I completely went off it. 
and I've been experiencing mild cramping almost like period cramps but no period, lower back aches, tons of clear discharge, frequent urination, and fatigue. I know these sound like pregnancy symptoms, but the last time I had sex was 2 weeks and 3 days ago, and that was while I was experiencing breakthrough (not withdrawal) bleeding that lasted a day. Then, a week later I got brown discharge that actually lasted like 4 days. 
So, I don't think I'm pregnant. Can stopping the pill cause these kinds of symptoms since your hormones are all out of whack? What has anyone else experienced?