To test 2 or even 3 times a day for the surge on OPK, some people can miss it if their surge goes by quickly and they only test once a day (there is a good explanation on the website peeonastick.com)
I wouldn't take the extra estrace unless your RE says it's OK (who knows they might give you a bit of stims to make the follicle grow and produce more estrogen to help lining) The poster babydance also was a day 14 or so ovulator but when being monitored on a natural cycle for IUI recently it was much later. Hope the delay gives you more time to get lining up.
I'd be dying to test for E2 LH P4 along with U/s to see where the numbers are tomorrow but that is up to you.
I tried to do a natural FET once, it was hard with all the monitoring and ultimately got cancelled, but I remember the research well.