Ahhh, Karen, now that's more of a post! :LOL I see where you're coming from now!
First of all, you are doing a lot!!!
Secondly, YES, period approaching and pregnancy signs can be very similar. In fact, I THOUGHT I was pregnant every month while TTC Cicely except for the month that I really was. My big hunger and smell were just minor compared to what I felt BEFORE I got pregnant. When the body gears up for fertility after pregnancy, it really comes on like pregnancy signs for me and I know for a lot of other people. Cramping, odd cervical mucus, nausea, exhaustion are all par for the course.
Now, that said, it's best to go take a test so you konw for sure. No use wasting your energy worrying over something that isn't. And, of course, if you had unprotected sex, there is a possibility that you are pregnant. Not a huge possibility, but one nonetheless. So, just put your mind and ease and find out one way or another.
Remember, if you are or aren't pregnant, it is for the highest good.