Pregnant or signs of impending period am freaking out?

I am on the pill, but did have a tummy bug so could've bn comprimised. Anyways had around time of what would be ovulation.. My period is due next friday and i am really tired also experiencing bloating and hot flashes.. I am 24 years old.. We did use a condom and it did appear to be ok.. am so worried Experienced crampin this morning.. My peiod isnt due til friday.. Could be pregnant???