First fertility clinic appointment and nerves :(

Jacqueline • Mummy to twin boys after 2years ttc 💙💙
Got my first fertility clinic appointment tomorrow with dh. After doing all the preparations I am starting to doubt going as it feels more real now :( I kinda know what to expect at my part but dh is slightly worried and wants to know if the men need to provide a sperm test that day? If so what happens If u can't? Sorry for questions just really nervous x