I have only done IUIs so far, but I begin to test about 3 days past IUI. The first few tests are positive because of the trigger, but the line gets progressively lighter so I can monitor when the trigger has left the system. 2-3 days after that the line should get progressively darker. In my one successful pregnancy, I got a light but unambiguous positive on FRER 2 days before beta. On the day of beta FRER line was as dark as the control line.
So basically, in your place I would probably start testing immediately. I am sure many would disagree but that's what I do and it works for me.
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