74 days since last cycle, off and on sickness, today noticing watery brownish cervical mucus. help please?

Possible pregnancy: or hormonal imbalance. First and foremost get a formal GYN exam and a blood pregnancy test. Your cycles are abnormal and deserve further evaluation.

If..: If your period is usually regular the first step to take is to get a pregnancy test if you have been sexually active. Other possibility in this case is an infection but the only way to give a final answer is with a pelvic exam. Other possibilities can be considered like ovarian cyst and hormonal imbalances. See a gynecologist for evaluation and final diagnosis.