So I took a pregnancy test today, since I'm about 2 days late and it came back positive. However of course right after suprising my husband and going out to dinner I went to the restroom and saw a really light brown spot about the size of a dime in my undies. No bright red and it doesn't seem like it is continuing now, but of course this just happened.  Is this ever normal in the very beginning of pregnancy or should I assume I may be losing this one?