Anxiety

Ftm and having serious anxiety lately. Not about the baby but about the birth. All I can think about is how babies and vaginas are not the same size- at all. And I don't think I can do this. After not so enjoyable and awkward sex with hubby to try and get things softened out I cried. Twice in the last 3 days. 9 days till due date and I'm terrified. Is this normal? I think probably not. Next appointment is Wednesday.