Hey Mel
I bled with clots after my c/s sporadically as you are. It seems as if the end is near and then I would begin to bleed heavily - i even got caught out going to my in laws without enough pads! I would call the hospital if your worried but it sounds normal compared with my situation. YOu can call the hospital at any time - that's what they are there for and they are usually only too happy to help!
I hope that helps - unfortunately everyone's situation is different! Good luck