Missed period. .

Is there a chance I could be pregnant and not know still? Haven't had a period since May 31st. I've took 2 home pt test both neg. Usually they are on time! The only time they were this long was when I was pregnant with my daughter and also I had trouble finding out for sure of that pregnancy and had to have a vaginal ultrasound bc I was having stomach pains. Added a little more info; Help please :) Btw 52 days late and cycles are usually 24 lenth days.