Hai mama, ini Braxton Hicks la tu, normal je at 30 weeks, especially kalau second pregnancy sebab uterus dah pernah stretch before. A few of my mum friends kata rasanya lebih terasa masa second pregnancy, kuat sikit. But since you're also feeling dizzy, asthma flare-up, dan generally weak, better check with your doc to make sure everything's okay lah, pregnancy is different every time, and kita tak boleh ambik chances when you're not feeling yourself.