Sayang, bleeding dalam early pregnancy ni memang boleh happen tapi kena cepat check dengan doctor, especially kalau ada cramping atau dizziness jugak. 4 weeks tu masih very early stage, so please jangan delay, go to your clinic or hospital hari ni juga to make sure everything okay with baby. A few of us mum friends experienced spotting early on (some okay, some kena monitor closely), so it's worth getting peace of mind from your doctor. Take care ya!