Ttc need answers pleaseee helppp

T

My cycles are regular every 27 28 days. I started August 23rd it lasted 3 days. Not to sure when i ovulated. Now i was supposed to start my next cycle September 19 and no period. All ive been having is ewcm. Took two tests and both are neg. Need some advise should i give up the cycle or wait it out. I am very confused..