If natural conception takes longer than a year, then, the cause needs to be investigated. The cause of the abortion
you had in the past should also be understood. After having 2 children, the cause of failure to conceive would be mostly local or hormonal. You could be ovulating but the hormonal disturbances may not facilitate conception and implantation
. Also maintain a healthy BMI, get some regular daily exercise and eat healthy. You can take folic acid
as a supportive medication
. Please consult a specialist for further support. Good luck.