Hi,
You would have to eat in excess of 10000 calories to gain 3lbs so I doubt that you’ve gained fat.
Our body weight can fluctuate wildly from day to day. I can weigh 4lbs more in the evening than the morning. There are many factors to be considered, what you’ve been eating as for example, lots of carbs such as bread can cause temporary gains on the scales. Food in transit, if you are constipated or not, retaining fluid, have recently done a heavy workout, and for women hormones and (if appropriate) time of the month can also have a huge bearing on what the scales say, which is not always a true indication of whether you’ve lost any fat. Certain types of medication can also have an effect.
If you haven’t already done so, take some measurements, waist, chest, hips, thigh etc. Your measurements and the way your clothes feel are often a better indication than the scales.

It will also take your body a while to get used to fasting so be patient, stick with it and remember the average weight loss for women is around 1lb per week.

I expect to see a post from you next week telling us that the scales or the tape measure have proved to you that it works.

Good luck 🙂

I’m on week 3 and I’ve gained 800g! Ive also been strict with it and very careful on my non fast days. I have lost a few cms around the waist and thighs though. So I might give it another couple of weeks to settle

Make sure you’re getting plenty of water/liquids, I think I read somewehere your body uses it to flush the fat cells, and certainly if you don’t take enough in, you will retain water and that can increase weight.