I can't tell you how many times I have been extremely late for my period. Every time, like most women, I thought I was pregnant. The most days I've ever been late without being pregnant was 8 days. Most of my late periods were due to stress. Sometimes you can stress yourself out so much that you can make your body think that you are pregnant. Therefore, you can get pregnancy symptoms and not be pregnant. But this last time I was 15 days late for a period and of course I thought of the possibility that I was pregnant. And it turned out I was. I think that you should wait, like your dr said (2 weeks) to find out if you are pregnant. I have heard of women who have had negative pregnancy test early in the pregnancy but was still pregnant. That happens often.
I wish you many blessings. And may God continue to bless you!!!