I know your stomach wouldn't be swelling this early in pregnancy if you WERE pregnant. The fetus would only be the size of a pin.
Could be water.
The metallic taste in your mouth can be a pregnancy symptom, however, it is also associated with other ailments.
When I was waiting to find out if I was pregnant, it took about a week also. I had that gut feeling that I was, and it turned out to be right.
I would just wait to worry until you know for sure in about a week.