6 weeks late for period 2 negative hpt, what could it be?

6 wk late period. A couple of possibilities: 1) you may have just missed a single period; this can happen and is common; may be due to stress. Wait for next period. 2) you could still be pregant; this is rare since the tests are pretty good, but still they can sometimes miss a pregancy. Best way to eliminate this possibility is with a blood test. If blood test is negative, then you just wait. After 3 missed, see md.