I think, (Alan please correct me...?) my midwife said so long as clots were smaller than the size of your palm (like, your whole palm, not "fits in your palm") they are not worth even thinking about. If they were bigger than that i was to mention it to my midwife when she next called (they came everyday after birth for 10 days, but i guess you could call them if they don't call on you anymore) and they'd check for other symptoms. To be completely honest, a lot of my biggest clots came out when i was sitting on the loo and i didn't fish them out to check the size, i just flushed! LOL

Bx