Discouraged and kinda scared....

So at my 36 week ultrasound baby girl is measuring 6.11lbs..... at this point of my sons pregnancy he wasn’t even 6lbs and he was almost exactly 10lbs at 41 weeks. I’m a little discouraged because I had a really rough delivery with him and I’m scared. My doctor responded to this fear as “you’ve done it before you can do it again” which I know is true I guess I was looking for more motivation and positive remarks about it. Just venting, sorry... hormonal and emotional!