Has anyone gotten pregnant while breastfeeding AND on the mini pill?

I just started the mini pill a month ago. My daughter is 4 months old, exclusively breast fed.

My period is over a week late and I've had some subtle pregnancy symptoms. (I guess they could just be period/ breastfeeding issues too.)

I have taken a test, which it was negative. However, with my daughter my tests never showed positive until I was two weeks late.

It has to be extremely UNLIKELY for me to be pregnant. Right?!