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If not, you could fluctuate during the day by kilos.
The first week of a new diet, you'll be all over the shop, as the amount of water you retain goes up and down with change in your diet.
It's why protein rich / carb light diets look so effective so quickly. You're retaining less fluids.
If you're hitting the gym, it will take longer to stabilise - getting swole means more water retention in the short term too.
Don't stress over the first few weeks.
Just get the habits ingrained. You'll all do fine!
Also make sure you weigh yourself at the most consistent time and body status as possible.
For example, straight after waking up, after a morning piss.
If not, you could fluctuate during the day by kilos.