A pregnancy test becomes positive 10 days after conception. Conception happens several hours after ovulation. Ovulation happens 14 days before an expected menstrual period is due. If your cycle lasts 80 days, that means that ovulation occurs around the 66th day of the cycle. A pregnancy test can therefore, become positive after the 76th day of the cycle. And because the age of a pregnancy is counted from the first day of the last period it appears that a pregnancy in your case can not be detected before the 11th week. Compared to most cases, where the cycle menstrual lasts about 4 weeks, pregnancies are detected in the 4th week earliest. The maximum duration of a normal menstrual cycle is 35 days. If longer than 35 days, the menstrual cycle is called "oligomenorrhea". Oligomenorrhea is a sign of hypothyroidism.
If your last period started on the 15th of November and your cycle lasts 80 days, then the next period should have come around the 5th February. If your pregnancy test now is negative, then you are probably not pregnant. The pink discharge you experienced around February 9th could have been your period. You can follow up with your gynecologist to track your reproductive health.