Thank you for your replies...they are vey much appreciated.

I am still unsure as to what is going on. Thinking that maybe it could be coincidence and that I could have picked up a bug. The nausea is persistant even waking me at night. Last night was much better though because I juiced some cabbage (an old remedy for nausea). If it is a bug which is pretty uncommon for me I am still suspect as I would have thought i'd get diarrhea. But I wonder if it's Giardia - never had it before but have heard that you can still have the nausea without diarrhea.

To answer one of the questions - I am sure that my last period was not implantation bleeding as it was normal (lots of bleeding) and we were not ttc last month. We did not have any accidents.

I'll test on Monday 13th and be sure to let you know the outcome.