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It is not due to the abortion
pill. There could be problem like infections, chromosomal disorders, problems in blood which can cause this. You should get a checkup with your Gynaecologist before you plan to conceive to rule out the above mentioned problems. One month before you plan to conceive you should take Folic acid tablet
0.5mg in the morning once everyday till end of 12 weeks of pregnancy
. Avoid long bumpy journeys in early pregnancy and sexual intercourse in first 6 weeks and last 6 weeks of pregnancy.