Alah, keputihan masa pregnant memang normal je, auntie! Terutama around 28 weeks tu hormone changes banyak, so discharge banyak sikit adalah expected, tapi kalau bening or milky and tak berbau, that's actually a good sign. Since yours is kadang-kadang ja and tak banyak, sounds okay, but kalau colour dia greenish, kuning, atau berbau strong, or kalau ada itching/burning, better check with your gynae cepat-cepat ya sebab boleh jadi infection.