am i running enough?

I was looking at my weekly mileage recently and I’m not sure if I’m running enough. I’ve copied my mileage for the past couple weeks below:

July 3-9: 21.4 miles

July 10-16: 10.1 miles (was on vacation this week)

July 17-23: 27.6 miles

July 24-30: 24.3 miles

July 31-August 6: 35.4 miles

August 7-13: 24.8 miles

I’m running Chicago in October which will be my first marathon. I haven’t missed a long run since training started, but I’m wondering if I need to start extending mileage during my other workouts so I’m steadily increasing weekly mileage. Thoughts?