SCOTUS is the body that defines what the Constitution says. If it says there is, there is. If it says there's no right to abortion, there isn't. That is, until it has a different membership with views that the majority of the country holds.
You and I agree that a woman has a right to choose at the begiining of a pregnancy. I think that everyone believes that a foetus also has "rights" and thus, after a certain point, the woman bearing it has obligations.
The difficulty is defining when those obligations intrude.
The fundamentalists say, point of conception. The law says sentience in many countries, including the US at a federal level. Heartbeat is the latest one.
For me, adequate time to discover a pregnancy and make a choice within the boundary of sentience makes the best sense. 5 or 6 weeks seems too short for that. 13 weeks seems a little long to me.
But it's a really horrid argument to have, let alone to have repeatedly, that's for sure. I don't think anyone else is having it so much these days because nowhere else is there quite such a dogmatic and political church.