The blood is normal. Some of mine do it every time they shed, some almost never do, it's perfectly normal.
The white "poop" isn't poop at all, it's urates. Urates are a form of urine that snake and some other animals produce. It's also normal.
A constipated BP is very easy to spot. They will swell up towards their tail until they look like a sausage. (We call it sausage butt). Unless your BP has this you have nothing to worry about. Here is an example of sausage butt:
http://ball-pythons.net/forums/showt...-Butt!-O/page3