Hello.....I Have Been Taking An Antibiotic, For A Week. I’ve

Hello.....I have been taking an antibiotic, for a week. I’ve had minimal appetite, and not consumed much food, but I have been drinking plenty of water. I haven’t had a bowel movement for 8 or 9 days. I’ve taken some “MiraLAX”, but still only some gas relief. I have a catheter in me from a urine retention. Should I worry?