Off evra for 3 weeks, active during ovulation; tired for past week, cramping, breasts feel full and sore. period not due til next week, can i test?

Sure: A pregnancy test could be positive as soon as 7 days after conception. If it is negative, then repeat the test after another week.

Sure: In general, home pregnancy tests are around 99% accurate. The most common problem with hpt kits is a negative result because the test was performed too soon after the expected onset of menses. If pregnancy is suspected despite a negative test, the test should be repeated in one week.