Pregnant ?

So I stopped taking the pill a little over a month ago and was still having sex with my long term boyfriend unprotected.. I was meant to start my period 3 days ago and no sign, I am NEVER EVER late not even by a day.

The past couple days I’ve felt slightly breathless, had headaches, dizziness and SUPER tired and nauseous after food, I’m wanting to know what people are thinking it could be, could I be pregnant am i overthinking or is it just my body adjusting to being off the pill? I am thinking about testing in a couple days but I want more opinions.. thank you!!