Nex..

So I got my nexplanon inserted on cycle day 6 (no more bleeding) has finished period few days before. Then had sex 5 days later...which happen to be according to my app two days before ovulation....it’s been 6dpo, and i feel pelvic pressure and extremely sore boobs. Can it be pregnant or from birth control???? Was the nexplanon effective by the time we had sex???