"this is a very effective birth control. yes you should always use condoms, even though condoms don&#039;t protect you from everything!!! anyhow, i got the nexplanon inserted on 12/2/2013 &amp; it is to be removed by 12/2/2016. in january 2014, i bled very light for a little over a month, except maybe 2 days of a little heavier bleeding. i haven&#039;t had a menstrual since like the second week in february 2014. i have had severe mood swings to the point i could choke someone for looking at me the wrong way. i have become very aggressive, extremely depressed and have cried over the stupidest little things. i&#039;m a cna, so i&#039;ve had back pain for quite some time. so i can&#039;t tell you if any may be from the birth control. more i can say..not enough space. :("