Late period neg test

[G3mini2]

I roughly came on my monthly a couple days before Christmas. I took a digital a couple days a go it was neg all the signs for period is here but nothing for 3 days. What could this be? I’ve never skipped a period ever unless pregnant

Very common, periods can be late for many reasons. Stress, late ovulation, no ovulation etc.
I’ve had a random one where I was late 42 days for absolutely no reason. If you’re not pregnant sure it’ll turn up eventually.