I need help!

So, I started my period October 9th (My first period since giving birth cake in August 2018 at 16 months pp, I got my second period in September), it lasted for a week exactly and then I was done. Well I was supposed to start November 9th and I didn’t, a week after I was supposed to start my period, I started having mild cramps and brown/pink/red discharge. It went away for a few days and now it’s started back. I’ve taken tests and I’m not pregnant, I’ve never spotted before I started my period. So I’m a little confused. Any of you ladies ever gone through this? I’m also still breastfeeding my 19 month old.

I would also like to add that none of my periods after the one in August were on time. The one in September was 4 days late, the one in October was 9 days late, I am now 27 days late and having mild cramps with some brown/pink/red watery to egg white discharge.

I have taken multiple pregnancy tests and am not pregnant.