What are you eating? It's not enough to tell us you ate healthy. What specifically did you eat?
I ask because I'm eating a low carb, high protein diet (I started this diet about a month before I started taking zep, so maybe all the nausea inducing stuff was out of my system), but make sure I have plenty of fiber throughout the day. I also drink coffee. I've had zero stool or nausea issues.
My doctor suggested an OTC nausea medicine - meclizine - but I haven't needed it.
Also are you taking real zepbound or fake? The additives in the compounded stuff could cause these symptoms, too.