All of a sudden good news-- thought this cycle was a bust

On day 23 all of a sudden I have a 16mm follicle and my estrogen roseThey want me back tomorrow for more blood and ultrasound. Anyone have success with an <a href="">iui</a> this late in cycle? 
We thought on day 20 we were canceling but my estrogen rose soo now I'm wondering would it be worth it to still do an <a href="">iui</a> thisnalreadty in cycle