okay i'm starting to freak out. my period is 13 days late but i have the implant. ever since i got it, my periods have been out of whack but they've never been this late! me and my boyfriend don't use protection because nexplanon is supposed to be the most effective birth control. but i don't let him finish inside me either. at first i wasn't worried but i'm slowing starting to really get scared. could i be pregnant or is my body just messing around with me?