Mini pill periods?

Leslie

So I started the mini pill after 6 weeks pp. 3 months ago I got my first period after baby and I have had 2 more regular periods that came on time 28 days in bewteeen. And now this month I’m a week late? I have taken a cheapy pregnancy test and it was negative. But I’m now reading that on the mini pill sometimes you don’t even get a period. What are some scenarios you have had?