missed period/ false positive

Hi everyone I have a app on my phone that I started to use to track my periods. They usually come around the sametime each month, not on BC either. I had unprotected sex a day before ovulation. I am one day late but test came out negative. My breasts are super sore, mild cramping no spotting or anything. But that can all be symptoms of my period coming. So pretty much not sure what to think now! help anyone!