Am i pregnant? where is my period?

im 22 yrs old i had for the 1st time june 13 and my period was due june 22 which didnt show up.i took a blood pregnancy test on june 23 and it was neg,but im having a lot of symptoms especially cramps mild ones mainly on the left side and lower abd, hurt,white discharge milkey like.today is the 26th of june and mt period usually goes off on the 27th. can my test be wrong or am i going crazy? or can blood pregnancy test be wrong? and my period is always on time