Definately no possible accidents since that one time.
The test i did wasn't the first morning wee, am thinking i will get another one just to be sure.
I have no symptoms etc as i got really early with my other two - its just the spotting which is confusing me... but i suppose could just be a coninsidence - maybe with me worrying about the whole thing.
I will do another test, and if thats negative might wait another day or two and if its still happening see what the doc says to put my mind at rest. thanks again.