Since the pain was very mild, brief, and now fully gone, and came after walking/yoga, it is most likely muscle-related or due to posture/strain.
But get checked if:
Pain comes back
You feel breathlessness, sweating, dizziness
Pain radiates to jaw/left arm
Pain lasts >5–10 minutes
What you can do now:
Check BP regularly; 130/90 is slightly high even on Telma 40 → discuss dosage
next visit.
If episodes repeat, get ECG + Echo + fasting cholesterol +
sugar as a routine check.