So frustrating!

My SO and I have been ttc for almost 5 years. We have been to the doctor, they have assured us that nothing is wrong and we are probably just timing it wrong. My period is 5 days away and all I want to do is take a hpt. I know deep down it'll be a BFN but every month I swear there is some kind of pregnancy sympton. I need some kind of advise. It's killing me inside. I don't know how much more I can take.