Falling pregnant on mini pill while breastfeeding

I have had this unsettling nagging feeling that I will fall pregnant so quickly. I’ve never had a surprise baby. My first we tried for over two years due to my endo. However after I had surgery we fell pregnant with my second rather quickly which we were truly blessed for!

Now I’m EBF and on microlut and I don’t know if it’s anxiety due to have a rather difficult pregnancy and full on labour but I’m so scared to fall pregnant.

I’d like to hear of women who have fallen pregnant despite being on the mini pill and breastfeeding. Is this irrational or is it possible!?