Hmmm, not sure Cl, but I know we have no idea when I O'd last month, because we never got a +ve test (normally CD12 I O) anyway - I tested up until CD 16 still got nothing.

I tested the morning of my birthday which was CD24ish (28 day cycle) and got a negative.

I didnt get my pos til the day after I was due (I didnt test until then anyway)

I'm not sure why it took so long to get AF tho? Did you ask your Dr yet? It would be interesting to find out.

Congrats on the BFP too