Pregnant & daycare job

Annelise • Mom of 5
Okay so I have an interview with a daycare tomorrow. They daycare is at a ski lodge so they are seasonal from dec to March. By the time I start if hired I will be 20weeks. Do I need to let them know at the interview that I am pregnant. Hours are 8:30 to 4:30. Is it a big deal being pregnant an working at a day care??