Need advice. Please help!

My first was a girl and I felt quite prepared to raise her. (She's two now) Must have been a mothers intuition cuz I never doubted my parental skills when I had her. Now I'm pregnant with baby number two and its a boy. Idk why but I'm TERRIFIED that I won't be a good mom to him or that I won't know how to raise him. I know my husband will help him learn to do the "boy stuff" that I see all nephews doing with their dads but still I'm a bit uneasy. Any words of advice from moms of boys?? I'd greatly appreciate it.