Pregnant while breastfeeding

Is it possible to get pregnant while breastfeeding? I’ve done some research and it’s all different answers. I’m trying to convince baby number 2 but I’m still breastfeeding my 9 month old. My period is very light and irregular so I’m using ovulation tests this month and so far I’ve gotten 3 positives so I’m wondering if it will work or if I’m just wasting my time?