Ivy - I actually spent 4 hrs in the ER of my local hosp last night for the same reason! After doing #2s I had some light pink spotting and passed a little bright red clot (sorry if TMI), after tests and scans, it was found that bubs' was happily rolling around in there!

The ob told me that the blood vessels around the cervix are very fragile during pregnancy and the muscular contractions (involved in doing #2s) can sometimes cause these blood vessels to rupture slightly hence the ocassional bleeding or spotting. I will be 18 weeks on Friday, and yesterday's 'episode' frightened the life outta me. In saying that, if at any point you are concerned, there is no such thing as being too paranoid, call your midwife or ob and ask the question it's always better to be safe than sorry