1 Incubation time varies with species, clutch size, and temperature and humidity in the nest. 2  The incubation time for most species is 45 to 70 days.  Research indicates that the sex of an embryo is determined sometime after fertilization, as the embryo develops, and may be temperature dependent.
brown discharge usually does not indicate a period. It could very possibly be implantation bleeding, however, as your using a condom every time it is unlikely. But still possible. If your actual period doesn't come I suggest a HPT. I'm not saying your pregnant, but it is possible.
I am 13, I have never had my period. But last month for 3 days I had brown discharge, I thought it was nothing, and then 3 days later it just went back to normal. It happened again this month at a similar time. That got me wondering, If it was at the same time, for the same amount of time... Its my period.