could i be pregnant wiv no 2?

Ok so i was due on last monday and did not come on til weds... but even then it was not like my usual periods, it as mainly just the odd spotting, i had this weds thurs and sat. i did a test last tues aswell but both come bk negative. im meant to be ovulating this weekend so will do obv test tmrw to see if i am. all this week i have had cramping like period pains but no bleeding, i feel tired, stressed and bloated.. do you think its possible that i could be or would it have shown last week on preg test. am i going crazy, because i want to be is it possible i could just be making myself have these symptoms? Advice please? x