Jangan risau sangat, dear, from what I've heard, this is actually quite common among mums who are still breastfeeding and on the pill at the same time, because both factors can suppress your period for months. My friend went through the same thing around 9 to 10 months postpartum while still nursing, and her doctor reassured her it was normal since the hormones from breastfeeding combined with the contraceptive pill can really delay things. That said, every body is different, so some mums get their period back earlier and some much later, lain orang lain pengalaman. Since it has been 6 months though, it would be worth popping by to see your doctor or O&G specialist just to be sure everything is fine and to have a little peace of mind.