So I'm on week three of dieting and getting fit so far I've lost 13lbs. However I've stepped on the scales today and put on 3lbs 😳 I've done nothing different. I've stayed committed. I am however on my period. I'm on day 4. Is this just period gain? Will it fall if when my period stops?

Edit- I weigh myself only in the morning

It's not obsession I have to lose 5stone because I'm am very obese. I use the same scales.