Medication abortion, does not require any handling with instruments in more than 95% of cases, so the risk of complications that may affect your fertility is extremely low.
Abortion with instruments is also very safe and the rate of major complications that could affect your fertility is very low, around 0.1% (1 per 1000).
The main factor that may compromise your fertility is not abortion but your age, because fertility decreases exponentially after age 35. Complications from STDs such as chlamydia or gonorrhea and certain diseases such as endometriosis are next on the list of causes of infertility.