Answers needed !

Okay so I’m on nexplanon and I’ve had it for about 3 months now and I have been having a light period for about over a month(light bleeding everyday)I had unprotected sex and the dude ended up nutting inside of me,now about a week later that long period stopped. Do you think it’s because I might be pregnant or because me having sex just threw it back off?? Need answers ASAP please and thank you