This happened to me this past cycle as well. I spotted for a day a few days after. It went away though.
Feb 2010 - IVF #1 BFP, miscarriage with D&C
April 2010 - IVF #2 BFN
June 2010 - IVF #3 BFP, Baby girl born March 2011
Oct 2011 - Natural BFP, D&C Dec
Jan 2012 - back to RE
Re: IUI & spotting
I did with my first IUI.
Good luck!
Unexplained Infertility
After two Clomid cycles, three injectable IUI cycles, two IVFs, two miscarriages, and one lap surgery, IVF #2 has brought us our little boy!
TTC #2
After months of being postponed or cancelled, FET #1.3 (Natural FET) brought us twin girls!