Freaking out :(

Soo got my Kyleena iud July 20th, the first day or my period that month... later one August 26, my boyfriend and I decided to try bare sex WITH PULLING OUT TOO! Plus he was really only in for like 3 minutes since we messed around before. Anyways August 28 I started my period. Everything was fine. But this month I’m seeming to not have my period. I’m freaking out I’m pregnant but my mom and sister insist I’m fine. That’s the reason I got my IUD. What do you all think?