6 week old puppies dewormed and now have diarrhea and worms in their stools!?

Hi, I have a puppy that will be 6 weeks on wednesday, and another puppy that is turning 6 weeks today. The reason I have them so young, is that I found them in a box on the side of the road, and have been bottle feeding them since they were 2.5 weeks old. Yesterday, we went to the vet and we were given dewormer. The younger puppy had half a tablet yesterday, and in 10 days he'll get another half, and the older puppy got a full tablet and will get another full tablet in 10 days. The older puppy now has diarrhea, and a little bit of red in her stool, it doesn't look like blood, as it's almost too dark and congealed. The younger puppy has diarrhea, threw up a little bit of the food he ate, and a few minutes ago he had awful diarrhea that had a long spaghetti type worm in it. I know it's normal for them to have diarrhea or parasites in their stools after they've been dewormed, but is the redness normal? I guess am I right in thinking all of this is normal? I'm very very overprotective of my babies, and just want to make sure that they're okay! Thanks so much in advance!