"i got the nexplanon inserted june 30 2014 a week or two after insertion. i had bleeding for 10-15 days, it stopped for about a month and a half and now i&#039;m spotting every time i&#039;m ready to become intimate with my boyfriend or just random times.  i have gained weight and i have felt some nausea.  yes it&#039;s very effective against pregnancy because you are constantly either spotting or bleeding unexpectedly. it&#039;s annoying i&#039;m getting it removed very soon. it&#039;s nothing fun about bleeding all the time. i appreciate a 4-5 day cycle now."