We were told we could stop our PIO shots and Crinone at week 10. We continued, as I had plenty of both, until week 12...just thought- it couldn't hurt. I've been off for a week and a half and all seems fine (knock on wood). Our OB didn't feel it was harmful that I had continued, but didn't feel it was necessary.
It is nice not having to go through the 'evening ritual'. Best to you!