No it wasn't, there were barely any female programmers because there were barely any programmers at all. Number of programmers has been exponentially increasing for a really long time, there weren't many of them before it became male dominated.

Programmer was also a different job then, which no longer exists.

How large part of this was actually secretarial work? Which has very largely disappeared with advent of personal computer in business. Lot of typist and such positions were women too. Not just teachers and nurses.