Help! Try natural or just do C Section?

I am currently 31 weeks and 3 days, I had a doctors appointment this morning, they told me my baby is measuring big his head is big which is from his daddy and also he's already at 5lbs... I am 4'10. They told me that I should more than likely consider having a csection because of how big he's measuring and how small I am, I am some what disappointed because I really wanted to do this vaginally and naturally, he is my first baby. I don't know what to do, any advice ??? Ps hubby was born a 9lb baby and I was born 6lbs 7oz so it could go either way if that helps