Skipping period/irregular while breastfeeding

My baby is 5 months old, and is breastfed. I have had a period the last 2 months, but this month I haven’t started (glow says 5 days late). Im on cycle day 32.

Could my period be irregular/skipped even after having “normal” cycles two months in a row? I’m TERRIFIED to test. We have been so careful and done all the things (no sex in fertile window, pull out, condoms, ect). We don’t want any more kids 😭

What’s the likelihood that this is NOT pregnancy? 😩😭