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.
During the second half of your cycle, progesterone increases and causes the lining of the uterus (a.k.a. the endometrium) to change so it can nurture a fertilized egg. If you do not become pregnant, production of estrogen and progesterone drops, and part of the endometrium is shed as your period. When to call your doctor: 2  If you're not pregnant and your formerly regular periods suddenly stop for three months; or if your cycle changes drastically (with your periods becoming infrequent -- more than 35 days apart, for example).