Back pay

I got a letter from social security saying I was entitled to monthly disability benefits beginning July 2017. The date you became disabled: it says we found that you became disabled under our rules on February 2017. To qualify for disability benefits, you must be disabled for five calendar months in a row. The first month you are entilted to benefits is july 2017. I'' recieve my first payment on august 9 2017. Do I recieve any back pay because I haven't worked in 5 months.