Late period

wondering if anybody is going through this so I have 2 period tracker on my phone Flo app says I’m 2 days late and glow app says I’m 4 days late so I went and had my yearly exam yesterday and I was exposing to my obgyn about what’s going on and so we did a pee test and it came back negative and I was hoping that my period on today and still nothing is there’s a chance that I might be pregnant really don’t make any since to me cause my period never acts weird or do anything like this help me understand please!