Am I possibly pregnant?!?!

I am 31, already have one child 6 yrs old. Me and my fiancée have been trying to conceive for about 1yr and a half. My period was supposed to come on two days ago and it's usually is on time. No systems indicating it coming. I'm nervous, because I don't want to get excited to soon. I have been tired, lazy, moody and my sleep patterns seem to be changing?? I want to wait until next week to take a PT.