I need advice

Ok so I have exams coming up and I'm so stressed and I had my period 5 days ago, Iv been having really bad tummy and back pains and am always so tired. I'm my head I keep thinking I could be but can't im on the pill and when we do it we wear a condom. Why am I thinking I could be pregent !! And I'm to scared to take a test 😭 is it just