Not sure when i am ovulating...please help!!?

last month my period came 4 days late. i usually start on the the 16th or 17th, but i started on the 21st. my ovulation chart says that i should ovulate today, but i have no eggwhite cm, which i usually do, and the ovulation test strips are still neg. i am having creamy cm, but thats it. we BD on july 2cd and plan to do it again when i get a positive ovulation test. are the tests just not working? could i have already ovulated? or how much longer do i have to ovulate this cycle?