Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.
Your INR is solid so it’s unlikely it’s another clot. I think being anxious and hyper vigilant about your breathing, checking your o2 all the time can really heighten what you are feeling. However, you might just want to check with your doc, explain what’s going on and see if he/she’s concerned.