I agree, but obviously the whole point here is to foreshadow the troubles ahead. Even though Gauri was trying to be honest she also was trying to say that she'll try her best to be a good wife and does want to spend her life with Rajveer. Rajveer though wasn't giving her that chance. He brought up the option of divorce right away because in his eyes Gauri loves someone else but couldn't tell anyone the truth and decided to get married. He doesn't realize that Gauri got married to him because she is ready to move on with her life. Hopefully they'll work things out, but as we all know the show is about to take a serious turn. So, along with Arjun and Arohi, Gauri and Rajveer are going to have their own problems.
Plus, who leaves bright and early the day after their wedding to jump into a dangerous situation? I'm guessing someone who is a little frustrated and would like to take out that frustration somehow.
I mean I understand that yeah they all are on duty and need to be there, but the groom could've gotten the day off and stayed at home with his new wife. Then in case they did need backup he could've rushed in. I don't see why his bhabhi didn't question that.
Anyways, just a few of my thoughts.