Congratulations on your surgery! Nope, don't worry about your weight the first couple weeks, in either direction. Your body is going through some major changes healing so it's going to be a little wonky for a little bit. One piece of advice? Try not to weigh yourself more often than weekly. You will yo-yo from day to day because of all the physiological changes happening. Weighing daily could be setting yourself up for a disappointment or giving yourself false hope. I found a once a week weigh-in just about guaranteed me a substantial loss. I've read posts from many members who were upset because they hadn't had a loss for like 5 days or even see a gain overnight. While these things are totally normal at times, you won't notice them if you only get on once a week.
Welcome to the group!