ok gotcha thanks. I would account for the slightly slower flowering time to the fact that I have no idea what genetics are. so these can be long flowering/mostly sativa. Plus the fact that temps in the grow room hover between 80 - 95 degrees. Sometimes it gets to 100 (although I am skeptical of the cheap device I use to measure the temperature.

Am I right to assume higher temps can cause a plant to flower longer?

even more info -

The germinated seed was planted 4/5
A guesstimate of the first sign it was a female - 6/18A guesstimate of when switched to 12/12 - between 6/24 and 7/01

So given all the info I have given you would you still suspect there is no need to worry? And 3 weeks - 1 month more would prolly be time to chop?