Just my imagination?

So I'm due my period today, it hasn't come yet I did take a test yesterday and came up negative, the last couple days I'm gettin extreme hunger pains, severe bloating and just off sorts, I'm wondering can you still get the pregnancy symptoms if you are testing negative 1st day of missed period? Or am I just holding onto hope, I haven't tested again today but I will tommorow, should I be testing positive by now if I was pregnant