Late period, but negative test

So my period is now three days late and I look 2 tests yesterday, both negative. I have been having weird symptoms lately like an extreme dip in libido and somewhat sensitive nipples. Not sure if these are actually symptoms of something or I’m just paranoid. I know stress can delay a period, but Glow is usually accurate within 1 day of determining my period start date.

I have been reading up online on pregnancy tests and some sites say they are most accurate in the morning, but the test I got said it’s 99% accurate starting the day you are late.

Has anyone else experienced this? Did you I end up actually being pregnant or was there something else that caused your symptoms? My periods are generally pretty regular. I plan on taking a new test tomorrow morning.

Please help!! We are hoping for a true negative. We just recently graduated college and this is not the time to give a child the kind of life we wanted to.

Also we always use condoms during ejaculation but sometimes get careless during foreplay.