"i&#039;m 18 years old and i got the birth control implant months ago. the first 2 weeks were horrible for me my arm was sore and itchy and just in pain. yes the implant does really effect your emotions i found myself getting sad or mad really fast, and cried for no reason for the first weeks. other then that it&#039;s great! don&#039;t feel it at all in my arm works 100% !!! everyone needs to stop complaining about it, i mean it&#039;s messing with your hormones i&#039;d expect it to make us emotional, everyone&#039;s experience is different, my sister got the stomach flu her first week. if you&#039;re really light in weight your period should be light and probably not even come. i just spot, but then again it&#039;s not 100% that you&#039;re not gonna get it or it&#039;s gonna be light."