Im heartbroken!!!!!!

Well I have a 28 day cycle ...was for sure I was pregnant and woke up this morning to brown discharge!!! ...put a tampon in... Put all the hpt away that were sitting on my sink waiting to use when AF didn't show ;( blaaaaaaa ....my period started 5 days Earlie! So strange but its not heavy at all not enough to Chang my tampon after 5 hours but I did anyways :( sad sad sad ...don't even want to try again and feel like this