How do I know if I can get pregnant again after having a past abortion?

Keep trying. Unless your previous abortion was complicated, you should not have trouble becoming pregnant. If you have been trying regularly for at least 6 months to a year with no pregnancy you may need your OB/GYN to check for a problem. Assuming that you have had regular check ups, there is nothing overtly wrong. It may just take time. If there is a problem, it probably is unrelated to your abortion.