Hi there, This is Dr Basu, Experienced Specialist. I am here to address your concerns and provide great service.
The swelling of the leg can be caused by the venous insufficiency.
Due to the lack of movement, the veins of the leg may not function well --the blod tends to stay longer causing leg swelling.
Another possibility can be a blood clot in the leg vein causing blockage to the blood return to the heart.
You are taking a blood thinner drug --still a blood clot is possible.
Lastly, if there is injury to the femoral blood vessels supplying the leg, that can also trigger significant swelling.
If you do not have any significant pain, then anything serious is unlikely.
Still given the rapid onset of swelling, you will need to contact your doctor for a clinical evaluation.
Usually the swelling will gradually improve with leg elevation and alo using compression stockings.
Follow a low salt diet.
A diuretic or water pill also can be used to remove excess fluid if there is no injury to blood vessel or blood clot.
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