Tahniah ya, you're at such an exciting stage! What you're experiencing sounds very normal, around week 5, the hormones are rising quite rapidly, so the nausea and breast tenderness coming and going like that is actually quite typical. Some mums find the symptoms feel stronger some days and lighter on others, especially before the placenta is more fully formed, so try not to worry too much if yours feels inconsistent. My sister-in-law had almost the exact same pattern, one dramatic day at the start, then just mild waves after that, and her pregnancy was perfectly healthy. Do also keep an eye on frequent urination and fatigue, as those tend to quietly creep in around this time too, even if they don't feel as obvious as the nausea. Wishing you a smooth and comfortable journey ahead, mama!