I NEED HELP

Marcela

so 5 days before period i had some pinkish brown spotting then the day i was supposed to get my period it didnt come until the next day and only lasted one day and it seemed like a normal flow mostly brown but my concern is why would it last one day has anyone had this problem? i am trying to get pregnant and i will call to make a appointment tomorrow and i took a pregnancy test today but its negative