4 days into a diet and losing weight?

Hello I have a question about healthily losing weight!

This Monday I started with a diet to get more into shape. Let me start with the context. I’m 28 years old, 1.65cm and weighed 76 kg on Sunday which I took as my starting point. I don’t wanna lose a lot but I really want to get back under the 70 kg maybe a little more.
I did a few of those online tests to check how many calories I should consume to lose weight and they all averaged around 1850 kcal per day split into 3 to 4 meals a day .

Since then I’ve been tracking my meals quite precisely. I decided to just weigh myself everyday to check when things would start kicking in but noticed the following. I weight myself in the morning before breakfast.

Sunday: 76
Monday: 75.1
Tuesday: 74.7
Wednesday: 74.5
Thursday: 73.9

This shocked me a bit? Losing 2 kilos in 4 days does not sound entirely healthy? But I’m not overly sure!
I have never been on a diet before. I do notice that what I eat now is Way less then how I used to eat before I started. I’ve also added more regular exercise to my daily schedule.

If anyone has some insight I’d love to hear it!
Thank you already :O

4 days into a diet and losing weight?