Hi Victoria, welcome!

Well you may have gained weight - but that doesn't mean you've gained fat. In fact if you've been following the programme perfectly, you almost certainly have not gained an ounce of fat.

You have quite possibly retained some water - very common with TOM (time of the month). Also, you may be right in saying your weight was a bit higher than 166 when you started.

Not necessarily!
I have seen many folk say they can't have gained muscle because they haven't exercise, but guess what? They have! It partly depends on how much protein you were eating before you began low carbing. If you've just come from eating insufficient protein, to a (WOE) way of eating where your body is finally getting the protein it needs, your body CAN grow more muscle.

Whatever the reason, Victoria, just keep on following the programme and before long you'll see some losses.

Cheers!

Rosebud