Omg can i be pregnant

Hello everyone,

I am in a situation as to not knowing if I am pregnant or not. It might sound strange because I should know due to having an adorable but very active 3yr old, but even when I was pregnant with her I didn't have any symptoms for 8 weeks which was when I found out. Now I know the main sign of possible pregnancy is missed period but I also know your body goes through changes as you get older. I track my period faithfully through this app and come to find out my period was supposed to have started 2 days ago. Still no sign of period. I took a test today results were negative. Should I wait longer to see if it's just stress or hurry to the Dr.?