Aunt Flow Question?

When did all you Mommas get AF again after birth? I had my son August 31st, got AF again (or so I thought) in November then missed December, got it again in January but now I'm 9 days late for February. 
I took a PG test at 1 day late and got a BFN
I'm not breastfeeding, but I take domperidone but not frequent at all. Maybe once a day (haven't taken it in about a week now). 
Argh so do you think they just haven't regulated themselves yet? Or what's going on? 

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