Clomid and neg opks

Nicole
Today is cd 19 and still have neg opks. I took clomid cd3-7. My cd21 test is friday. Im so worried. I usually O on 16/17 on my own. But i had a TR in march so started the clomid this month just to make sure i am Ovulating. Temps are all over the place. Feel defeated and only been a couple month.