Ay salamat sa tanong! Yun ay actually normal, maraming moms around 4-5 months na ang nausea ay lumabas na, kaya hindi mo na siya ramdam tulad ng first trimester. A few of us in our circle noticed the same thing, parang by mid-pregnancy nawala na yung constant queasiness. Pero if you're suddenly feeling really off or may ibang symptoms na nakakaalarma, better to mention it sa OB mo next check-up just to be safe, lagi kasing may surprises ang pregnancy! Congrats btw, fourth-five months na kayo!