Someone please help me out 😂

So I’m on my 3rd implant I had it replaced May 21st and haven’t had a period since the 1st week of June and my app is saying I’m 14 days late I’ve had no discharge or signs of a period coming at all. I wasn’t sexually active at all during that time until this past weekend I had sex twice without a condom and both times my boyfriend pulled out before he finished. I know this is probably a dumb question and nexplanon is 99% effective but should I worry about pregnancy if there’s no ‘period” ovulation?