When should I test.

Ladies I am in need of some help. I want to know when I can take a pregnancy test. My LMP was April 1st. Today is CD31. I am not really sure when I ovulated because I never really got a positive opk. I just got a flashing smiley for about a week. I took clomid CD3-7 and tested at 11DPO. Some ladies said they saw the start of something but all I saw was a blank test. I don’t have my usual PMS so I don’t think AF is coming anytime soon. Clomid always works for me, as far as ovulation and getting a cycle. In fact clomid makes my 35+ long cycle to a normal 28 day cycle. My cervical position is still high, soft and tons of milky CM. I really wanna test but I don’t wanna see another BFN. Also i got a blazing positive opk on CD28. I’m so confused.