Wa'alaikum assalam! PDG test tu actually bukan sama macam OPK, OPK check LH surge (ovulation), tapi PDG (progesterone metabolite) check kat urine lepas ovulation dah confirm, so kau kena beli test kit yg khas for PDG, bukan OPK je. A few of us tried PDG kits (ada jual kat online stores macam Shopee atau Lazada) sebab nak confirm ovulation actually happened, bukan just nak predict je like OPK, memang lain reading altogether, so kalau serious track cycle kau, mungkin worth it to try both or just PDG if kau nak final confirmation!