Whyyyy is this happening? 😫

My daughter is 14 months old and I still haven’t had a period since having her. I’ve been breastfeeding, but I am down to breastfeeding at night and in the morning. Sometimes once throughout the night also, but not always. My doctor said he wants to see me because that’s not normal to have had a period yet... that’s questionable to me, BUT I have had several positive OPKs in the past couple months, but still no period. Anyone have any ideas why I would be getting positive OPKs, but no signs of a period? 🤔 (all HPTs have been negative)