After birth control removal ..

I been having irregular periods , spotting .

I had my 2nd baby in November 2017 after that I got nexplanon birth control, I noticed that I didn’t like the symptoms, especially the weight gain, so I had it removed in April or May , I had my period in July it was crazy heavy bleeding for 8–9 days

Then in August it was the same 8-9 days heavy bleeding

But in September ( currently) it was just spotting for 4 days then it stopped for 2-3 days and started again now it’s still just spotting

It it normal to be having on and off spotting after removal?

I know I’m not pregnant because I been using condoms and I’ve checked 2 times so that’s out of question. Can I get some insight on this