right leg pain

I am a healthy early 70 year old woman who is experiencing leg pain at night. For over a month I have been doing about 20 mins. of stretches every morning and walking about 2-3 miles every morning at a local community center. For the past few weeks I have had leg pain at night. Last night it was severe and if I had not taken 2 aleve and rubbed with BenGay(not sure that helped), propped by legs (both hurting last night, I would never have gone to sleep. I know I have some arthritis but doing my exercises does not hurt in the morning. This morning my knees are somewhat stiff. Leg pain is not so prevalent, but night is coming. Do I have a circulation problem?
 
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