Hi, Courtnoo! Welcome to BoneSmart. Sorry to hear your calf is bothering you. You do need to keep an eye on it.
Cindy was right about contacting your surgeon's office following your Emergency Room visit. If you didn't, give them a call on Friday to let them know the outcome and what tests were performed.
At this very early stage in recovery you are going to hurt and have swelling. The majority of your day should be spent with your leg elevated above your heart (that's more than just sitting in a recliner!), ice on that knee, and taking pain meds on whatever schedule you are permitted all through the day and night. You will be getting some exercise getting up to go to the bathroom and to the kitchen to eat. It's good to move around every hour or so using your walker for stability and safety. If the hospital showed you some basic exercises, you can do those throughout the day, but don't push too hard or you may increase the swelling.
If your calf continues to bother you, don't hesitate to go back to the ER. A clot is nothing to mess with. I'm assuming you are on some type of blood thinner - Lovenox, Warfarin, Coumadin or aspirin...right?