Thanks for the query.
If you tracked the ovulation by kit, there is possibility of pregnancy
if you had unprotected intercourse
around that time.
But if you are thinking of ovulation just according to dates, that may or may not occurred.
Because after undergoing D&C, the time of recurrence of ovulation can differ from person to person.
If the pregnancy is there, the spotting you had could be implantation
In the absence of pregnancy the spotting could be due to causes like, hormonal imbalance, post ovulatory spotting etc.
Urine pregnancy test kit may not detect early pregnancy sometimes.
For more details : http://srsree.blogspot.in/2012/05/pregnancy-tests.html
So better to wait till your expected date of periods.
If you miss the periods, go for blood test
for pregnancy or wait for one more week and repeat urine test for pregnancy.
Better to start folic acid
supplementation from nowonwards.