when did you know??

my next period isnt for 6 days, but i feel...different. is it possible to feel pregnant before you miss your period?? ive gotten angrier easier, ive been tired all the time, i feel dizzy during the day. idk ive done this before, where i syke myself out because i want to be pregnant soooo bad that i imagine symptoms, but even my fiance has noticed things. i guess ill update if/when i miss my period.