Blood clots?

Just wondering if its normal to have various sizes of blood clots after second CS? I'm 4 weeks PP, some days I bleed, some days I don't. At around 1½ weeks PP my incision started to split apart and during that time I had pain while urinating, what could this be? (didn't check up with DR about that) at about 2 weeks PP I noticed blood clots and 3 weeks I noticed in would get cramps before rushing to the restroom and have a clot fall out of me while urinating. Now I'm 4 weeks PP no bleeding but I occasionally will get a grape (or a little bigger) sized blood clot. Should I be concerned? It's acompanied by cramping