Period 01/05-01/09 followed by very light pinkish/light brownish discharge off and on01/31-02/07. mild cramping. extremely sleepy. mild nausea but 4 negative pregnancy test. could i still be pregnant?

Possibly. not likely: It sounds like you had a period at the normal expected time (approximately 25 days from the start of your last menstrual period) but it was different than usual which can sometimes indicate a pregnancy. If you had unprotected sex after your last period in January, it's possible. If your next period doesn't come or is irregular, I'd see your doctor to be checked.