What is a urinary catheter used for? I thought I'd rest before giving …

What is a urinary catheter used for? I thought I'd rest before giving birth, relax and sleep while in pathology, and then go give birth with renewed strength, but I find out something new and not very good. 1. Low blood volume 2. Hemoglobin 89 3. A urinary catheter needs to be placed tomorrow morning. The doctor comes on rounds only at 11-12 pm, until then I seem like I'll lose my mind. Although my condition and the baby's condition according to the ultrasound are normal. P.S. In our maternity ward they can't even explain anything properly, the attitude towards pregnant women and mothers-to-be is terrible. If you want