Negative Pregnancy Test

my period is late. i have all the symptoms. i did not want to be pregnant at all just because i’m still very young and wish to do my education before thinking about babies. it is still early days of my period being late and after me and my ‘partner’ had been intimate. however when taking my pregnancy test, it came up with negative. i didn’t want a baby originally but i feel a wave of sadness. it’s silly because i don’t understand how can i be upset over something that was not there in the first place nor did i want? i feel like a horrible person. any advice ladies ? x