Welcome to the EmpowHER community. Thank you for reaching out to us with your concern.
I can appreciate how you must be feeling right now.
Disregard the faint positive line which you saw on the first test. Go with the first negative result. Waiting give you an inaccurate result.
The most accurate result was from the third test which you took using your first urine of the day.
Since the results were all negative, you can assume that you are not pregnant.
For peace of mind and your sanity, please contact your gynecologist, who can order blood tests to check hormone levels. Since the menstrual cycle is regulated by a precise balance of four hormones, estrogen and progesterone, follicle stimulating hormone, and luteinizing hormone, any imbalance will cause a change. Your doctor may choose to check your thyroid function levels.
Please keep us updated.