Also, many pregnancy symptoms can be explained by other things going on. For instance, I've had all the pregnancy symptoms in the book and have not been pregnant in various given cycles. When I actually was pregnant, I had the same or similar symptoms both times, all of which could have also been attributed to the progesterone I was taking. Progesterone and estrogen are actually what can cause most of the early pregnancy symptoms - and unfortunately, both cause pms symptoms as well and they can be very hard to distinguish. Symptoms caused by hcg - like needing to go to the bathroom more often or nausea, don't tend to take effect until a week or two after your missed period.
Hope all of that helps. Waiting sucks, but maybe try some yoga or meditation or whatever it is that helps you to relax, wait a few days, and test again. I find testing can be so infuriating and confusing and frustrating sometimes. Taking a break from the tests can really help.