Sayang, kalo period dah miss 4 hari, better you go see your doctor or clinic ASAP untuk confirm, they can do a simple test je, takde risk. Keputihan yang jarang keluar tu boleh be anything, so jangan guess-guess sendiri. A few of my mum friends pun pernah paranoid about these signs, tapi kena check with doctor baru tau betul-betul. Go lah, mana lama sangat, and you'll have peace of mind!