upk ka opk? opk tu guna utk tau hari subur kalau jenis yg irregular period. kalau jenis yg period regular x perlu opk pon. just download apps period tracker je utk tau hari subur. upt tu pulak guna dia utk kesan hormon hcg dlm urine. which is nak tau kita mengandung or tak. upt buat sebaik nya selepas delay period. lagi tepat.
Anonymous