Pregnant or Early Menopause?

Well, I am so very confused and worried to death. Maybe that is why I am late. I mean I have been like clock work with my periods my whole life and I am going on 39 the end of this month. So to be pregnant this late in life, is just WOW! I just don't know. The only time I have ever been late was the two times I was pregnant! I thought for sure I was pregnant again and I keep taking pregnancy test after pregnancy test and they all turn up negative. Went to the doctor and he did one, urine, and it was negative. So told me not to worry about it, but yet had mentioned cancer. So now I am WORRIED even more! Pregnant or cancer.....what a choice!?!?! I would rather take the pregnancy, even though we JUST sent my step son off to college, this would be so weird to have to start all over. So my dr called to get me in to an gyn and said it would be two months, well I decided that was just wayyyyyyyyy too long, so I called around myself and will go Thursday. But let me tell ya, this is killing me!!!!! I have never been late, its always been like clock work. I was due to start 7/25. Do you think maybe its just so early on in the pregnancy its not detecting it or what? Any suggestions or insight here? Someone just wanna chat with me to keep my mind occupied I am up for that too! LOL ITS DRIVING ME INSANE!!! I can NOT stand the NOT knowing!! LOL
Please dear God, give me strength! T