Positive test while breastfeeding?

Moriah

So hubby and I have been trying for a few months now for baby #2. I’m still nursing my 15 mo so my periods have been all over the place. I thought my periods were back to regular since I’ve had them the past two months consistently. My period will be a week late tomorrow but every single test I’ve taken has been negative. Has anyone experienced false negatives while breastfeeding still?