I had implanon put in 2 weeks after DS was born and it was there for nearly 2 years, I had pg symptoms every month when AF was due, AF would often come with extreme pain and really heavy bleeds, i was moody, i put on weight, it nearly split me and DH up due to the moods and constant bleeds that would just start in no pattern and often last up to 3 months. My sister and a few friends also had it with the same result. I personally would not recommend it. Both of my sisters now have the IUD and swear by it neither get a period and both say its not uncomfortable or anything, and thats the way i will go once this bub is born.
Have a great day
Mel