Hi, and thanks for your medical question on eHealth forum!
Since you had a D & C and had bled following that, it is possible that your periods are delayed this month. If you still did not get your periods, then repeat the pregnancy test as it is possible that you could be pregnant but since the ovulation was delayed, the test was not positive earlier.
If it is negative, then consult your gynecologist to find the cause. D & C can also delay the periods but so also other reasons such as PCOS, hypothyroidism, anemia etc.
Hope this helps. Take care!