I do know that not even all surgical abortions are accounted for, because all the states of the US do not have uniform reporting requirements. California, Maryland, and New California, Maryland, and New Hampshire do not report their numbers to the CD at all.
The Alan Guttmacher Institute always reports significantly higher numbers than the CDC, since the CDC relies on official reporting, while the AGI relies on their own private surveys of all known clinics, hospitals, and private providers of all kinds. AGI is considered to be more reliable source.
I think it would be even hard to track medical (chemical) abortion, since the actual death of the victim occurs out of clinic. And sometime (not often, but sometimes) the woman might get the pills but change her mind and decide not take them; or she takes a progesterone antidote after the first of the two pills, and blocks the effect.
All they could tell you is, how many prescriptions were filled. If that's reported accurately.
Plus, there are companies that ship RU-486 to these United States without asking for a prescription, so even if we had an exact count of prescriptions, missing information. More statistically significant, a large number of RU-486 users are not pregnant, while 99%+ of abortion receivers are.