Spat single dark blood clot at night.

Hello Doctor, I am a healthy non-smoker with no existing medical conditions. Around 25 hours ago, I spat out a single thick, dark reddish-brown jelly-like blood clot mixed with saliva (attached photos). Key observations: - Isolated episode: Happened just once while clearing my mouth/spitting. Saliva returned completely clear immediately after, and there has been zero bleeding, discoloration, or recurrence for over 25 hours now. - Zero symptoms: No cough, chest pain, breathlessness, sore throat, nosebleed, fever, nausea, or abdominal discomfort. - Diet: Normal home-cooked dinner 3-4 hours prior (no beetroot, supplements, or artificial red food coloring). - Habits: Never smoked, no alcohol, no tobacco/gutkha use. Could you please advise: 1. What are the most plausible sources (e.g., minor post-nasal capillary ooze that pooled, or a superficial throat capillary break)? 2. Since 25+ hours have passed with zero symptoms or recurrence, is an in-person ENT exam/scope urgently required?