Help!!

Been trying for a baby with my partner for 8 months now. No luck what so ever... According to this app i was due my period last week but still nothing is it silly to get my hopes up? Iv been low in mood and feeling down which dosnt help but Iv been a lot worse than usual? I'm refusing to buy a test as the last 6 are all negative don't want to be disappointed again. Thanks for reading you's are very kind and helpful x