We got 26 day-old chicks from the hatchery almost 4 weeks ago. This is our first time raising chicks ourselves. They have been doing wonderfully, growing like crazy. Then today one of the chicks I noticed was sitting in the corner and kind of breathing heavily. Then suddenly she started twitching and died while I watched.
There was blood underneath where she had laid an coming from her vent. We were in the process of moving the chicks from their brooder in the basement to their coop (but hadn't moved any of them at that time), went ahead and moved the rest of the chicks and so they had fresh bedding. I went in to check on them about an hour later and saw one of the other chicks poop and it looked like pure blood. ????? Now what do I do? They seem healthy but should I treat them with an antibiotic? I am so scared they have a disease and they will all die! Also, I am pregnant and afraid to handle them if they are ill, should I not be in with them now? Here's some further info:
-all chicks are the same age and we have no other birds
-were vaccinated at the hatchery for Marek's and Coccidosis
-eating non-medicated chick crumbles
-on wood shavings
-were in a clean brooder in our basement under heat lamps and seemed comfortable although was getting a bit crowded
-had fresh food & water & I changed bedding weekly
-have all seemed healthy, no symptoms till today (and I check on them several times a day and watch behavior)
I'd appreciate any advice as we are clueless about this sort of thing! Thank you!!!!

-all chicks are the same age and we have no other birds
-were vaccinated at the hatchery for Marek's and Coccidosis
-eating non-medicated chick crumbles
-on wood shavings
-were in a clean brooder in our basement under heat lamps and seemed comfortable although was getting a bit crowded
-had fresh food & water & I changed bedding weekly
-have all seemed healthy, no symptoms till today (and I check on them several times a day and watch behavior)
I'd appreciate any advice as we are clueless about this sort of thing! Thank you!!!!