Still no AF.. 3 DAYS LATE!

Katie • Working on Baby Maynard number 1!
AF was due Christmas eve, still no sign! Just mild cramping. Any ladies have a negative with no period but test at a later date and get a positive because getting pregnant later in your cycle? I'm still not testing until tomorrow but nervous we didn't get pregnant until after glows ovulation prediction.. & worried about a false negative.. Ugh!! Getting pregnant has made me a worrier times 1000!