Need advice

Ok so me and my fiance have been ttc for 5 months now and my next period is due on sep. 17th but the past couple days i have felt way over tired even when i sleep all night i feel nauseous all day long even if i eat a full meal and i have slight on and off cramping i kind of want to take  a pregnancy test but i dont want to grt my hopes up yet!! Anyone have any advice😀