Ahhh jangan risau dulu lah, hormones masa breastfeeding memang sering jadi unpredictable especially dalam first year, a few of us had delayed or skipped periods for months while nursing! Two days late with a negative PT is actually pretty common, badan kita sometimes need more time to settle into a routine, especially if you're exclusively or mostly breastfeeding. That said, kalau dah 1-2 minggu lewat and you're still worried, better check with your doc just to be safe okay, bukan apa, just peace of mind je.