Agree w/ @JakeH, and that its different when you are in weight loss mode vs. Maintenance.
I started exercising for reals at 3 months post op and kept my calories under 600 no matter if it was an exercise day or not (at 5-6 months post op I was staying under 800). Stayed ultra-low carbs (>25g NET carbs).
Now, as I’m not actively trying to lose weight, I try to stay within 1800-2000 calories (but I also do some moderate to heavy exercise almost every day). My bad though, as I will admit the quality of these calories may not always be of the best kind (i.e., sugar). I try to stay under 100g NET carbs, but I don’t always succeed (i.e., sugar!)
Further, I prefer to do my running/strength training in the morning, in a fasted state. It may just be me, but I feel more energetic and nimble when my stomach is empty. Food makes me feel lazy and sluggish for some reason. Also, like @ChubRub, I do not feel particularly hungry after exercising, but I will eventually in a couple hours or so, and I’ll eat if I’m hungry.
Long story short, at 6 weeks out, maybe just eat if u are hungry, while sticking to your prescribed calorie range (and don’t forget to get your protein and water in!)
Good Luck!
P.S. I am NOT a medical professional and am providing anecdotal comments based on my own experiences. It’s advisable to check with your doc when starting a new workout and nutritional regimen ❤️