Missed periods being a vegetarian?

For reference, I am 26 years old. Two years ago, I went vegetarian around the same time I started nursing school since then my periods have been irregular. I got out of nursing school a month ago and I skipped my period completely this month. I thought it was maybe due to stress, but I’m not sure since this month has been really chill for me. I know I need to go to the doctor, but I start my new job this month and I’m waiting for my health insurance to go through.

Just wondering if anyone has had experience with this?