Not surprisingly, your math isn't very solid. Prior to Gorsuch's appointment, the Court had two ideological wings and some moderate/pragmatic members who could go either way depending on the specifics.
Ginsburg, Breyer, Sotomayor, Kagan - solidly in favor of abortion rights. They would affirm Roe in full and likely vote to overturn Planned Parenthood v. Casey, which kept Roe but gave some wiggle room for states to enact some restrictions on abortion that they couldn't previously enact. They meet the Democratic Party's litmus test on the issue.
Thomas, Scalia, Alito - solidly in favor of state's rights to restrict or ban abortion and willing to overturn Roe in full.
Kennedy - unwilling to overturn Roe but willing to nibble at the edges and uphold some restrictions. He joined the plurality opinion in Planned Parenthood v. Casey.
Roberts - He's willing to uphold some abortion restrictions, but whether he'd vote to strike down Roe is unknown.
I know this is advanced math for Oklahoma, but the Court has 9 justices. That means you need five to form a majority. If you're counting, you'll see three justices in favor of overturning Roe, one who is unknown, and five who were unwilling to overturning Roe. Gorsuch replaced Scalia. That only secured the third solid vote.
Kavanaugh would be the decisive fifth vote if Roberts decides to go along. It's also worth noting that we don't know what Kavanaugh would do. His prior judicial record doesn't establish anything.