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.
1 Birth control: Birth control can cause irregular periods and spotting or brown discharge. 2  Pregnancy: Implantation can cause your discharge to look brown. 3  It may also signal a problem with the placenta. 4  Miscarriage: Some women will see dark brown blood or discharge during the early stages of a miscarriage.