Etonogestrel
"My nexplanon was inserted on January 20th, the last day of my period. I'm afraid of needles but it didn't hurt as bad/just a slight tug and pressure when inserting! This is my 1st BC ever. 

Now it's 02/09/2017 and I noticed some spotting last night (originally it's 3 days left until I would normally have my period) I never spotted before throughout any of my periods. I thought I had started last night when it "felt" like my normal period symptoms, except this morning, I only had brown discharge but No. blood  

My arm was aching for about 1-2 weeks after it was inserted and I have two toddlers (1 & 2 year olds) so I try to avoid them laying on my arm or touching it. 

So far, I like nexplanon. Hopefully my overall, future, reviews are great!"