Hi osucowboysgirl, I have two young children and from the symptoms you have described, it is possible that you are pregnant. Stress, in some cases, can also produce similar symptoms. The only way to be 100% sure is to take a pregnancy test. The ideal time to take the test is around the date you would be due for your next period and during the first morning bathroom visit when hcg levels or pregnancy hormones (if present) are at their highest. With my first child, I suspected I was pregnant however the tests didn't confirm this until I was six weeks along.
Good Luck. Hope you get the results you wish for.
P.S. Once a fertilised egg implants itself into the lining of the uterus, you are automatically two weeks pregnant. So, if you are pregnant, you would be at least four weeks in.