Late period

My period was due to come on the 1st they usually last about 6 days and are normally pretty regular always on point with the app or within a day or 2 never this late it is now the 20th the app says I'm 19days late i took a test yesterday and it was negative im not under any extra stress or anything I have some light cramps at night that make me feel like I'm about to sart when I lay down but af doesn't show i havent had really any pregnancy symptoms i just have no idea what's going on and with the covid virus going around im alitte afraid to go to the doctor right now anyone have any suggestions