If I take the abortion pill, will that put future pregnancies at risk?

No. The "morning after pill" is for the "morning after" and is soon out of your system in a few days, and would have no impact on any future pregnancies.
No. Medical abortion will have no impact on future pregnancies. Mifeprex (ru-486) and Misoprostol lead to a miscarriage of the pregnancy, and from your body's perspective it is no different than a natural miscarriage.