Weight after pregnancy... not losing?

Okay mamas, I have a health question for you. I delivered my son August 3, 2019. I gained 38 lbs during pregnancy and by the time my son was 4 days old, I had lost 15 of that. So I still have 23 lbs left to lose.

I started walking at the beginning of week 4 pp, cardio 5X a week at 5 weeks pp, and finally cardio/strength training 5 days a week at 6 weeks pp. I have also been tracking my calories and macros, and basically I’m in a caloric deficit of 500-1000 calories EVERY DAY (still eating 1500-1700 a day, don’t worry, I’m not starving myself).

But I HAVENT LOST A SINGLE POUND. It has been 4 weeks of this and I feel like I should have at least lost something. I mean does that sound normal?

Other potentially important info: I pumped exclusively for 2 weeks but had to stop and switch to formula. I had my first pp period right around 6 weeks. I got my IUD the day of my check up. I am not stressed at all. I haven’t suffered from ppd.

I have no clue why I can’t even lose a pound and putting all this work in and not seeing results is frustrating. I did message my doctor and I’m waiting for his response, but has anyone been through something similar?

Sorry it was so long, I ramble sometimes lol.