AF two days late---but BBT slightly dropping

Patricia • I`m 25 and been TTC for one year. My wedding anniversary is December 2011!
I was supposed to get AF on Monday And still nothing this Morning...my bbt was higher than usual since last Friday and is dropping slightly,but is sti higher than normal...I haven't tested yet. I want to wait till tomorrow morning. Kinda nervous. Even if my bbt is dropping slightly could I be pregnant or is that a sign they period will come, just later?