Do we have a chance this month

1st test was from yesterday. 2nd test was from 2pm this afternoon. (We DTD after that a couple times because hubby has to leave for a business trip and I ovulated really late this month). 3rd test is from 9pm this evening. Which it looks like it's going back down negative. Do you think we have a chance this month? I normally O on cycle day 15 and this month it was on cycle day 20.