Ah, actually quite common la! Egg white boleh keluar a few days before OPK turns positive sebab cervical mucus changes happen first, then hormone surge follows, so you're on the right track. Since your OPK baru positive hari ni (5/1), best time to try is today and tomorrow, maybe the day after too, sebab fertile window around 2-3 days from positive OPK test. Timing-wise, aiming for today onwards will give you the best chances since sperm can survive a few days anyway.