Yeah that must be it-either that or an old edition, because I can't find the "right" to an abortion in it and my copy still has the second amendment in it.
There certainly is no delegated power in the US Constitution to prevent abortions. And the second amendment does not say "Every person shall have the right to possess every gun anytime they wish." Even in the gun-grabbers paradise of Illinois one can own guns.
Actually from its construction it is arguable that it is as much a right guaranteed the states rather as one guaranteeing an individual right. States were very worried about federal power and, since they created and officered the militias, did not want the feds to be able to remove the manpower for those militias (all able-bodied men) by disarming them. This amendment appears to essentially say "The federal government will have no power to disarm the militias." These were intended to be the only governmental armed forces since standing national armies were unacceptable to most of those living in 1787. States (being unconstrained by the Bill of Rights) passed laws against firearm ownership as they wished and some prevented Blacks from owning them until the 20th century.