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There could be many possibilities. If the D&C was done after abortion
then scars would have formed inside uterus and caused blockage of menses to come. There could also be presence of cervical stenosis which can also be due to D&C. If you have not had D&C the causes could be presence of Fibroid which is blocking the cervix and causing block of menses blood flow. Even certain hormonal
disturbances like big ovarian cyst
can cause such a problem. It is best you wait for 7-10 days from expected start day of period till period starts and if it does not come then you need to do a Pregnancy
test. If pregnancy test is negative then consult Gynaecologist to examine you and look for such mentioned problems. Drink plenty of water. Avoid constipation
by eating plenty of fresh fruits and green leafy vegetables. Do daily brisk walking for 40 minutes.