Kyleena IUD, late period, and cramping

Hi so me and my SO had sex about 3 weeks ago with pull out and now I’m 12 days late for my period, but I’m also on one of the hormonal IUDs. I haven’t gotten any pregnancy symptoms except sore breasts(which may be PMS?). I’ve also recently started cramping the past 2-3 days very very similar to my normal period or IUD cramps I’ve had previously, but no period. With my strings remaining the right length, I’m curious why I haven’t actually started my period (especially considering I’ve started normal timing the past 2 months after insertion), however I’ve heard this was one of the IUD symptoms. Any thoughts? Overthinking or pregnancy?