Yes I am almost 3 weeks out and I’m having the same issue
I went through a period of dry heaving pretty violently due to my nausea and worked out it was due to one of my pain reliefs. (It was horrendous, had to roll up a towel to place over my incision in hopes I didn’t bust it open every-time).
I was also nauseous for about 2 weeks after my section and couldn't eat properly. Not sure why but could have been because my guts were moved around or because I was on blood thinning injections and iron tablets 🤷🏼♀️ I'd recommend speaking to your post natal team (or whoever you would speak to depending on where you live) just to put your mind at rest 😊