Sayang, I'm so sorry you're going through this while pregnant, that must be really scary. Please don't wait for the ambulance; call your hospital or klinik kesihatan again NOW, or go to the nearest A&E yourself if you're having chills and not feeling well. At 33 weeks with COVID, you need to be checked today, not waited out at home. Your baby needs you to get help faster. I know it's stressful, but jangan tunggu lagi, your health and baby's safety come first right now.