Don't wanna get my hopes up.

Ok I was diagnosed with Pcos when I was 16, I've always had irregular periods, but I started working out about six months ago and I've lost about 20 pounds and my periods have been regular the last five months... So my fiancé and myself have been ttc, my doctor wanted us to try for 6 months without any medicine, I'm suppose to be on my period now but I am 4 days late!! I took a hpt on Monday and it was negative, so i don't know if I tested too early or if I'm not pregnant. I have some symptons, but not enough to say if I'm pregnant or if my mind is playing tricks on me :( I wanna be pregnant so bad.