Fighting more than usual

My fiancé and I have been together for 3 years and got engaged on Christmas. Before being engaged we almost NEVER fought and since then we are always fighting over the weirdest stuff. Like it almost feels like we’re both looking ahead 20 years and thinking about our future selves in our current fight/situation (for example before COVID we were traveling and he left without telling me and I was upset because I’m thinking what would happen if we have kids and he left). This has never been an issue and I wasn’t mad that he left I was more upset for my future self and future situations. Does that make sense? Is this normal???