Period Pain - No Period ???

I had a VBAC about 11 weeks ago. I stopped bleeding after about 4 weeks, had a browny coloured discharge (old blood) for another 2 weeks.. After 6 weeks I was back to 'normal' and not bleeding at all... then 4 weeks later I start to get bad periods cramps and waiting for the period but nothing...!! It's been 4-5 days that I've had period pains now and all I ever had was the browny discharge again for about 4 days and now not even that, but yet the pain is there!?? Has anyone experienced this before or possibly have an explaination?

I stopped breastfeeding after 10 weeks also so I was just expecting it to be my period... It almost feels like contractions (nowhere near as bad of course) and yet 3 weeks between this I was completely pain free...