A very small subset of your decisions are one-way doors. Non-reversible portals into bad realities. These ones should take you more time. They require more information.
Third, you possess imperfect knowledge of other people upon whom the outcome of your decision relies; and you possess imperfect knowledge of their future state. In light of the last point, especially, marriage is an act of faith.
So practice making fast decisions. Accept the risk and emotional labour involved in doing so. Course correct when you make mistakes and don’t get pregnant unless you really want to.