Exercised a lot, and ate a lot, its been 2 weeks and still no period, pregnancy tests all negative. Any reasons?

Anovulation. You've had a cycle in which the ovary failed to release an egg. This disrupts the usual hormone levels and causes the cycle to be abnormal.
Anovulation. Missing your period could also be related to your weight and fluctuations either up or down. Stress can also affect your menses. Repeat your pregnancy test to be sure.