How many A-Bombs did we have at the time beyond the two that were dropped?
I believe that number was zero. I think I read that the third would’ve taken more than a month or so to be built and delivered.
https://en.wikipedia.org/wiki/Atomic_bombings_of_Hiroshima_and_Nagasaki
Groves expected to have another “Fat Man” atomic bomb ready for use on 19 August, with three more in September and a further three in October;[91] a second Little Boy bomb (using U-235) would not be available until December 1945.[235][236
https://nsarchive2.gwu.edu/NSAEBB/NSAEBB162/72.pdf
After that it would have been September before we had more but at that point we could have cranked them out at the rate of two a week.