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.
Prior to menstruation on CD 26 (Normal 28D Cycle), I had dry brown discharge only when wiping. I am now on CD 30 and no menses yet and the same discharge when wiping. I am exhibiting some signs of pregnancy (sore breasts, low back pain, nausea, fatigue) and had a negative HPT on CD 28 with first morning urine.