20 and trying

Ive been trying for goin on 3 months now and im starting to feel as if i cant get pregnant 😭 im 20 i always felt lime it should be thay easy to get pregnant at my age...idk i need help tips anything my period did end 3 days early idk if thats a sign or bot it was supposed to end ob christmad and its normally 7 days .i got a negative pregnacy test today ...help