Scale not moving

Really getting frustrated. I fast every weekend from Friday at 6 pm to Monday at 6pm and then break with something small. My regular eating days are Tuesday-Thursday averaging about 1200 calories a a day.

The past couple weeks during the weekend the scale has not moved!! I work as a nurse on nights so I’m constantly moving and getting plenty steps in. I also only consume water. Literally zero calories until Monday evening. What can I do?? I feel like I’m losing my mind. I know it’s calories in vs out but something is not working.

Information about me:

24Female

Starting weigh: 245 lbs

Current: 204 lbs

Height: 5’9

Steps averaging 8-10 k

Please any advice!!!!