If the pregnancy
test was performed immediately after a missed period, it may not be positive. Ideally, the test is done with a fresh early morning sample 3-7 days after the missed period. So, you should repeat the test and see. If it is still negative, it is more likely that she is not pregnant and this is only a delayed period. The cramping may be seen in early pregnancy as well as in premenstrual phase of the cycle. See a gynecologist for a physical exam and a trans-vaginal sonogram. Take care.