Your urine being clear is GOOD SIGN. You want it to be clear, that means you are getting enough fluids in your body and it is ridding of all the toxins within. You cannot die from drinking the amount of water you are currently consuming.
A spike in LH and FSH (LH surge) causes ovulation, following a suppression of GnRH. Estrogen levels continue to rise following ovulation and the corpus luteum forms, which secretes progesterone in significant levels and causes decreases in LH and FSH levels.
Your body produces hormones such as estrogen and progesterone. These hormones are found in the pituitary gland, the hypothalamus and the ovaries. They send signals to one another to trigger menstruation and ovulation. When the hormonal signals are deregulated, it can cause an early (or irregular) menstrual cycle.