Eh, at 37 weeks this can happen, some of us get the dizziness and nausea towards the end, tapi memang tak semua experience sama even with second or third pregnancy lah! A few of my mum friends complained about the same thing near their due date, could be the hormones, blood pressure changes, or just the weight of everything pressing down. Better safe to check in with your doctor or midwife just to make sure everything's okay though, especially since it's different from your previous pregnancies, no harm getting it confirmed, kan? Hopefully it's just normal third-trimester stuff and you'll feel better soon!