Welcome to HCM.
It is very unfortunate that you had an abortion
It is preferable that you plan your next pregnancy
at least after 3 months. You have not mentioned your age. If you are over 30 Yrs. then better to try for pregnancy as early as possible but if you are in you early twenties, you may delay the next pregnancy even for 6 to 8 months.
You need not take any precaution in particular. Try to avoid medicines in the early period of pregnancy, eat lots of fresh green vegetables, drink lots of water, have food rich in protein.