Oo, totally normal yan mama, especially with exclusive breastfeeding, marami sa amin na nagbreastfeed exclusively, ang regla namin ay delayed o irregular for months, sometimes up to a year pa! Kasi yung frequent breastfeeding talaga ay nagsupppress ng hormones na nagtatrigger ng menstruation, so it's your body's natural way. Since negative ang PT mo twice and you're not having any pain or weird symptoms, you're probably fine, but if you're worried or if you do get spotting na parang abnormal, why not swing by your OB lang para sa peace of mind? One of my mum friends didn't get her period for 8 months while exclusively breastfeeding, then it came back on its own, walang problema. For now, I'd say relax lang, but if something feels off sa body mo, better safe than sorry talaga!