Brilliantly well done on staying 100% - don't think I could have dealt with that sort of temptation so early on! My family made sure they didn't eat around me for the first few weeks... bless them!
You notice different things as you go on - for me, the scales were the first obvious sign. I weigh myself pretty much every day, so it was great to see it drop every couple of days!
I had my wardrobe arranged with clothes (trousers, mainly) in order of how much too small they were for me and I tried them on every week or so. Just looking in the mirror I still couldn't see a difference, myself (though others said they could...) but trying the clothes on and seeing the zips get closer and closer reassured me that it was working. Getting back into my favourite turquoise tartan troos (in my avatar) was my first big "WOO-HOO!" moment.
I think it took probably a month before I felt I could see a difference in the mirror. I now regret not taking any "before" photos to compare with. I'd really suggest you do that, and do it as honestly and un-flatteringly as you can. It will be amazing to be able to compare, in the future.
Possibly around the same time I noticed that it was getting a lot easier to climb the stairs (my room is in an attic, so two flights used to be exhausting and leave me out of breath - so disgraceful, with hindsight). Now I can virtually run up them!
Hope you discover all these and more,
Enjoy your journey,
Marianne x