Spotting?

I am 5 weeks today and I missed my period completely, no spotting.
One the day I tested and was positive I had some sparse bleeding since that morning causing me to think I was not pregnant when in fact I was.  
Not a lot of bleeding but more than spotting from what I am reading.
No pain, no bad cramps.  Went away over night and came back late afternoon today.
Not heavy but still, more than spotting.  Can see it on my pad 
Thoughts??
Called my obgyn when I had a positive test and told her I was bleeding and she said that this was normal as long as it wasn't heavy 
I'm super nervous...