Crazy irregular periods!

Teri

My periods have been super irregular these last few months and I keep having pregnancy scares because of it. Until they started getting wierd, my periods were every 4 weeks. On time each month for 4 or 5 months. Then I was 7 and 1/2 weeks late. The next period I got was only 2 and 1/2 weeks later!! And now I am 5 and 1/2 weeks late 😩

What is going on?! Should I see a dr or is this no cause for concern?