New to Keto

Hi, my name is Ann and have alway struggle with my weight. I was about 187lbs around this time last year now weight 207.8lbs, am 5’ 3” and 61 years old. I had my thyroid removed in August and on   Synthroid. I started the Keto life style this week after reading many books blogs, and feel I have a good understand. My beginning weight was 207.1, the following day 205.7, then today 207.8! To say I’m frustrated is an understatement.  I need help!