5 days late

So I’m 5 days late. I took a pregnancy test yesterday and it said negative. I think I’m going to take another one in the morning. I’m usually on time, and if I’m not I’m normally only 3 days late at the most. I’m also not experiencing any pms symptoms like I usually do, early cramps, sore breasts, cranky, craving lots of food. Could I be late because of stress? I’ve had two huge stressful situations happen within the past month.