Hi and welcome to HCM.
Thanks for your query.
Yes, TURP surgery does have a post-operative healing time, during which the inflammation caused due to the resection will have to heal. All blood and other residue left during surgery, will have to clear out, either through the catheter or while urinating.
Post-operative antibiotic coverage is a good option, and will prevent/treat infections caused. You could wait a while longer, and then visit your treating surgeon for a followup ultrasound
examination of the region.
In the meantime, have plenty of fluids and cranberry juice, as both contribute in relieving symptoms.
I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications. I would gladly help you.