Hi, I recently had a pulmonary embolism and was prescribed warfarin. My INR levels have been good. My last reading was 2.2. However, suddenly today I started getting a sharp pain in my groin. It wasn t bad at first but now it is quite painful. Also, it started shooting pain down my right calf. I am worried that it may be another clot but I don t know how that would be possible. Also, It seems to go away when I am sitting, but hurts when I am standing or walking. Should I go to the ER