In my opinion if you have EWCM, this is the sign that it is time to DTD. I didn't have regular 28 day cycles, didn't temp etc... so this was pretty much what I went off & it worked. Even when I had O pains, I didn't always have the EWCM. Why is ttc so difficult??!! I would DTD right up (not necessarily every day) until you are due for AF, that way you surely wouldn't have missed it.
Good luck, I hope you have some positive news in the next fortnight or so.