I Have Tightness In Both Of My Legs. I Know

i have tightness in both of my legs. I know what a charley horse is, and this is not it. Kind of feels like it needs to be massaged out. Im worried that it may be blood clots. this has been going on for about 1 month now. Today is pretty noticable. i work 8 hours a day and do about 75% of the day. I do get up to the printer, bathroom, meetings, etc. I do very light exercise as in walking and stretching.
what do you think?