Evening nausea?

I am CD19, I have shorter cycles on average due to weight (usually 23-25 days) . I know I ovulated early, and I have had plenty ❤️ time in that window. Since CD17 I have had consistent nausea and stomach discomfort, but only in the evening. I’ve also majorly lost my appetite. I’m so confused by this, and I know I am too early to test by a few days. My body typically gives the same symptoms like clockwork leading up to my period. Did anyone experience this type of nausea? Is this “morning sickness”? Am I overthinking it? Can I take a test CD23 (the day I am anticipating AF, and get an accurate result? Help please and thank you 😍