Periods after baby

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My little ones 5 months old. Ive had 4 periods i guess but 2 for real. 6 weeks after she was born i had a VERY light period like it was only on the toilet paper when i wiped i had cramps and everything... Then when she was 13 weeks i got a full blown HEAVY period like filling a tampon in 1.5 hours... Same for my period after that. Now shes 5 months AF was due 4 days ago. For 3 days ive been having the same spotting and cramps as the first time. I haven't breastfed at all the whole time. Is it normal for periods to be jacked up like this??