Of course, weight loss does not always progress in a two pounds per week step wise motion. Weight fluctuates often.

You can read more about it in this thread Do you really expect all your progress to be loses?

Also, all carbs are not created equally. Nuts and cheese and low carb bars are notorius stallers for some people.

You say you've been doing this only three weeks? Are those daily weighings? Weight can fluctuate during the week too. Try weighing just one or two days a week, or if you have to weigh every day, average them for the week.

A stall is 6 weeks with neither pounds nor inches lost...not days!

BTW--welcome to the forum from a fellow Mainer!

Beth