Hi DevonJohn, well done for getting through the surgery…another hurdle over in this journey! It could have been a DVT, as you say a possibility post surgery, which is why keeping mobile straight away is important, and anticoagulants would clear it, obviously the greater risk is clots blocking main vessels. Just out of interest my OH is awaiting the op and at his pre-op he was told he would have anticoagulant injections each day for 30 days post surgery, which seems extreme, but I guess different policies for different health authorities.
Hope the remainder of your recovery is trouble free!