It is indeed normal to get blood tinged mucus and the clots for 3-4 weeks post surgery. This is nothing but the collected blood in the sinuses
which comes out with mucociliary clearance. I feel, you would have been asked for follow-up after 2 weeks following surgery to clear the clots from the nasal cavity
. If not, no need to worry continue with the medications advised and if the symptoms do not subside even after 4 weeks please go back to the surgeon who operated for a thorough post-op evaluation.
Dr. Naveen Kumar