Cat crying after cystotomy

Hi all! I have what is hopefully a quick question.

My cat had a cystotomy about 7 hours ago. 3 stones were removed. She did amazing and has been eating and drinking since she got home. She had her first pee, and started crying afterward a few times. The pee was a good amount.

Her urine has blood which the vet told me to expect, so I’m not worried. But is the crying normal? When should I be concerned if the crying doesn’t stop?

Normally I would ask my vet, but they are closed until tomorrow morning, so I figured I’d ask here. Thanks in advance.

This is a 4 year old female, American Longhair, 13.5 lbs. spayed, history of cystitis, on onsior post surgery for 3 days as well as gabapentin and prazosin (as advised by vet). Blood tests prior to the surgery were all within normal range, can provide if needed.