Etonogestrel
"For the first 3 months everything was dandy until I found out that in those 3 months I got pregnant I got this to prevent anything like that happen, however my nurse didn't inform me that certain pills can reduce its efficiency, I ended up having a miscarriage. 
So I put that failure down to lack of knowledge, as time went on I had 2 months of no period then an entire month of bleeding. I've been getting spots and hot flushes caused by this, not to mention I've suffered from severe depression and anxiety caused by the implanon which caused me to stop eating because I had constant knots in my stomach and despite this no eating I've went up 3 dress sizes! 
I suggest getting the 3 month jab and seeing your reaction it may not be horrible for everyone."