"20 yr. i got nexplanon jan 7th about 8 days after my period. i did have the initial arm pain around the implantation site, but i didn&#039;t spot right after the implant. i started my period about 28 days later and it was mild at most, for a day. then, it was more like spotting for about 4ish days, and all i needed was panty liners.  i have been taking aerobics for 10 weeks and i gained weight instead (&lt;8lbs). i have had mild mood swings that i didn&#039;t even realize until i read other reviews. i still have strong sex drive. however, i have yet to get my period this month going on 2 weeks late, so i took a pregnancy test and it was neg. overall, i really like this contraceptive. it&#039;s the first one i&#039;ve tried but so far it has worked pretty well."