If you're feeling these symptoms but you're not due for your period for at least another two weeks then your symptoms are likely unrelated to pregnancy and possibly symptoms of ovulation.
During ovulation, which usually happens halfway through our monthly cycle, about two weeks after your last period and two weeks before your next period, we experience a surge in hormones that can certainly make us feel awful.
There's a possibility you had an early ovulation and became pregnant then. If that's the case and your symptoms are indeed caused by early pregnancy then you should be alright to take a pregnancy test any time after Saturday, March 10th.
Otherwise, I would say that you should begin testing after Wednesday, March 14th.