Normal weight loss ?

OK so I pinned 0.5mg on Thursday and pinned again 0.5mg on Saturday. I weighed this morning and I've lost a kg since Thursday. Food noise is still very much a thing. Ive had no symptoms really other than a 4bpm higher than usual resting heart rate. Probably in a deficit of around 200-300 calories a day.

I am concerned the weight is coming off a little quickly. I weigh 58.4kg (I body build so this is to lean out as I really do struggle to get the last few pounds off). I have kept my protein high 120-130g a day, drink plenty water with electrolytes. I train 4x a week with 3x 30 minute zone 2 cardio sessions. Any thoughts? Water weight?