Pregnant or irregular period due to B/F

HI LADIES🤗...

My period went back to regular cycle around 3months after I had my daughter last October , I know breast feeding can effect the cycle but never the less it eventually became regular since January

All of a sudden this cycle no period I'm around 9 days late having pregnancy like symptoms

This happened last month took a test 2 days after period due date bfn.. period eventually came 2 days later

So my question is any of you lovely mums experience the same issue?

I plan to breastfeed till 12 months is this normal to experience regular then irregular cycles 😁