Omnicef and hips

my 1yr old started omnicef 9 days ago, she had dark red poop the whole time, but sometimes it was solid, and other times it was almost mucusy, she was up every 30 min to an hour every night crying and/or screaming, she was very uncomfortable in her private area, when I would lay her in my lap to try to get her to sleep she would move her hips around and open and clothes her knees, and she was very cranky for parts of the day, I took her to the Dr. on the 3rd day, she tested her poop and found no blood and said lets wait a couple of days and see how she does. unfortunately I didn't think about looking on the internet for any answers, I'm glad I found this information, she will not be taking her last days medicine.