Hi I'm 17 my period was due yesterday sep10th bt it wasn't normal my blood was pinkish red color and it was very lighter dan usual today it was a little heavier not really but da color was dark reddish brown I really need help am I pregnant ?

No way to tell at all , at this point, you need to wait this week out and see if normal period comes. Also not all periods every month are "normal" so being off once in a while is not uncommon either
You can have a first light period and be pregnant, but it may be about two more weeks for a pregnancy test to show up properly.