What Does Swollen Ankle Post Vascular Surgery Suggest?

THANK YOU I HAD VASCUALR SURGERY O0NB THE 20TH
STAYED OVERNIGHT IN HOSPITAL
DISCHARGED ON THE 21ST
WALKED AROUBND ALL THAT DAY
EVENING NOTICED QUITE A BIT OF SWELLING IN THE RIGHT ANKLE
CONCERNED WENT TO THE EMERGENCY AFRAID OF A BLOOD CLOT
HAD ULTRA SOUND
NO BLOOD CLOT
HAVE STAYED IN BED A BIOT ORE WITH LEGS ELEVATED
DO I HAVE A CONCERN\SOME SWELLING HAS GONE DONE