Normal je, sis! Especially kalau breastfeeding, period boleh delay lama, some of my mum friends didn't get theirs back sampai baby 6-7 bulan or even later. The progestin in Norriday can also suppress bleeding further, so combined effect lah. Tp since you're on the pill already, kalau dah worried or kalau ada spotting yang weird, better check with your doctor just to be sure semua okay.