Confused by my weight loss

Hey y’all,

I’ve been TTC for a year now and was advised to lose weight before beginning any drugs. my goal is to get to 12 stone (168lbs / 76.20kg) from 15 stone.

I’m currently at 13 stone 8lbs - not far from my goal! I’ve been dieting for a month but began cutting down in November,

Anyway, I’ve been steadily losing 2lbs every week since the start of January just from my diet change, but when I weighed yesterday I had lost 6lbs in a week!!

I don’t know what I’ve done, my diet has been exactly the same, I’m so confused by my weight loss and my scales are definitely correct because I weighed on my sisters scales too to double check.

I have PCOS and I’m wondering if such a huge loss is something to worry over?