8 weeks pregnant but Losing weight eating normal (2000-2100 calories per day)

Hi guys. Im a bit worried ive lost a total of 3kg since july 10 (in 2 weeks). Im 8 weeks and 6 days pregnant today. Is this normal?

I have apas (lupus anticoagulant syndrome) for which i take heparin shota at night.

I am very overweight to begin with( bmi 35)My doctor had recommended i go on this strict diet which will ensure i wont gain or lose weight and i follow this to the point of measuring / weighing the food.

I walk for an hour every other day or sometimes every 2 days. I dont do anything else im usuall just sleeping in the house literally.

Ive had zero vomiting and have eaten according the 2100 calories diet. Im worried about having loat so much weight in 2 weeks (i could even do that when i was not preganant and actively going to the gym)

Help! Is this normal?!?! Has anyone had this? My next docs appointment is next Wednesday, im wondering if i should go in earlier. Im so worried as i had 2 miscarriages last year, where i felt nothing wrong until i got the bad news. 😭😭😭😭😭