It gets tricky with IUI if you're using fertility drugs. I've known women who start testing immediately after so they know, when they get a negative, that the drugs are out of their system. That way they feel much more comfortable trusting the results.
If you aren't using the drugs, it's the same as everyone else. You may be able to get a postive at 10dpt, but your best waiting until your cycle is due or late.
at 9:11 PM on Feb. 6, 2009