Spotting issue

Hi yall.  My hubby and I just found out we are prego (home tests only - blood test is scheduled for confirmation ) .. I tested with both clear blue and first response the week i missed my period .. Tested three days in a row (15,16,17dpo) and all came out positive.   Yesterday and today I've been spotting very lightly and brown and not bloodlike red. Im a little concerned.. Spoke with a nurse and she said its most likely normal but i'm curious if anyone else has experienced similarly? Im currently waiting to hear back from my Dr but cant help being anxious and worried.
Thanks for any input.