Long cycle question...when to test?

This month I was on Clomid 100mg (1st month on this dosage, last month 50mg no ovulation). My cycles since going off the pill have been 31-32 days long. Last month I had a 35 day cycle and the first day of my last period was April 10th. I got a positive on an OPK on the 28th (day 19) and my bloodwork showed my progesterone level at a 9. Anyways I am currently on day 34 and am wondering when I should test. I want to make sure to not test too early! Thanks in advance for any answers!