Is it normal to have nasal congestion after having covid. im on day 15 i tested negative on the 3rd. i still have this nasal congestion and some post nasal drip. slight cough as well but more worried about the nasal congestion?

At this stage we start to think of sinusitis. If your nasal mucus isn't heavy or discolored it doesn't appear to be a secondary bacterial infection which usually requires a course of appropriate antibiotics. With mild symptoms I'd sit tight for another few days. A nasal decongestant oral medication or nasal spray can be helpful. If not improving, see your MD for evaluation & advice.