19 days late

Hey guys, so I’m 19 days late. I had sex w a condom and he pulled out on April 8. Got my period April 20-27. But this month I haven’t gotten it. I took a pregnancy test this past Friday so I think that was like 15-16 days late by then just in case and it was negative (thank goodness). I don’t know why I’m late and I’m always on time, by like 2-3 days wiggle room. But 19 days is insane. So I’m just wondering what it could be bc I don’t think I’m pregnant but I don’t know what else would do this. They say stress but I mean I don’t think I’m that stressed. Anyways let me know what y’all think.

Also I think around February I took plan b twice within two weeks (stupid I know) but it’s been fairly consistent since then. If anything I’ve had a more frequent period. So maybe that has something to do with it but I just don’t think the effects would last this long?