Missed Period

I need some opinions..

I am on the pill but my boyfriend and I use no other precautions to prevent pregnancy..

I have been feeling very emotional, hungry and thirsty the last 2-3 weeks.. I also had spotting one week before my expected period.

I started my placebo pills for my birth control on Sunday— now Friday and still no period yet I’ve gotten 2 negative pregnancy tests.

I usually get my period on Wednesday and am very regular due to the pill.

Can stress cause someone to completely miss their period or is it more likely I have gotten a false negative