Nervous

Hey everyone I need some opinions. Me and my fiance have been trying for 6 months now and no luck. The past 4 weeks I've been feeling different having pains cramps sore breasts mood swings and just weird things happening. Hoping it's true but I went to wallmart bought pregnancy tests took both of them one Friday night and one sat morning... they were both duds no negative or positive nothing showed up. Yes I took them the right way... but I just feel as though it's a sign but I have no idea what type of sign.... please help me I'm stressing and if it's true I shouldn't be stressing....