Late period

My period has been late so I've changed it on my log and it's late again... usually it's arrived by the time of it been late if that makes sense! By breasts have been sore and sensitive for longer than normal so I'm confused... we are ttc is it too early to test? This has happened to me before and then my period arrived but my breasts seem to be sore for longer than usual! I've had slight feelings that period is coming but nothing yet! I don't want to get my hopes up again for nothing! X