Hi!
The bleeding could be implantation bleeding because it is happening at just the right time.
The breast discomfort is probably related to progesterone.
I would definitely recommend testing for pregnancy soon. 14 days post IUI is not too soon to do a first test.
Good luck!
Dr B
Hello: If you dont mind I would like to know the outcome. I had an IUI dont on June 30 and 2ww will be tomorrow but for the past two weeks (with all the fertility meds) I have felt horrible. Cramping, sore breast (inbelievably sore) neaseau, exhausted... all of the above. However, yesterday when I wiped I saw the same brownish color. Today - still not heavy if anything but not almost like AF is going to start.. Tomorrow is testing day --but I am very nervous that this is AF and not implatation bleeding.. Any suggestions?