Fertility clinic closed on weekends?

Jamie

Needing advice/insight from those who have had their fertility clinic closed on weekends. AF is coming almost definitely tomorrow. I'm supposed to call when she shows and last cycle (1st IUI) I had a cd2 scan but now cd2 would be Saturday. What happens if the clinic is closed?! I have naturally short cycles so I did clomid starting cd2 and cd10 trigger & cd11 iui, so I feel like there's no much room to wait...