Yes, it's very normal to feel nervous. Why? Because our spouses act and say things that aren't "normal" to us. They are different in many ways from the people we knew...so, it's like meeting someone knew for the first time. You don't know what to expect from them.
I wouldn't worry too much about it...go and have fun. Enjoy the time you are there and like I said, if it gets to you, politely excuse yourself and go home or to a coffee shop for a bit. Nothing says you have to stay for a long period of time.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
