Could I still be pregnant?

Out of all of my years of living I’ve never missed a period nor have I been more than 2 days late for a period. I’ve never been on birth control either. I took a pregnancy test 2 days ago and it was negative. One app says I’m 6 days late and the other says I’m 10 days late. Last period was 5/22-5/26. What do you all think?