From a conservative position, I don't believe the desire to overturn Roe has anything to do with whether or not abortion remains legal at any stage of pregnancy. It has everything to do with who should be making our laws. Elected representatives, accountable to the voters, or unelected unaccountable judges with life appointments.
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They're going fast!
Overturning Roe Vs Wade would not necessarily have to be based on a woman's right to privately murder her children, just as long as she did it before the end of the first trimester. It could just as easily be based on a decision as to when life begins. Does life begin at conception, or does God only recognize it after it has been in existence for three months?
Plan B is then for each of the individual states to answer the question for themselves. Many will ban the practice. Others will not, and in those states the fight will continue.