Birth control implant and migraines

Nothing worked prior to the implant…3 conceived while using another form of controlled release birth control, and my last 2 were planned by getting the implant removed. My periods are somewhat irregular but also extremely lighter than before and shorter lasting, however I have noticed every other month that it’s rougher than before, cramps, headache etc. but then 19 days later it’s just normal. I’ve also been able to maintain the same weight while using the implant and regardless of changes in my lifestyle that would suggest a fluctuation in weight over the last 7 years

Placed 6wk postpartum. Lots of bloody/brown discharge since . No true period. No pain Migraines, weight gain, sweating, mood swings. But I’m not pregnant

Nexplanon is a great contraceptive, I have had no pregnancy scares. Break through took about 1.5 years last 2-3 months of constant spotting older blood.