Implementation bleeding??

Laura
4 days late and started spotting... only shows up when I wipe and is very light... took a test this morning and it was negative... I am usually regular with very heavy flows and I haven't even touched a liner in the last two days... I had mild cramping when the spotting started but then went away.. Sore breasts, nausea, headaches, and dizziness over the last week or so... am I testing too early?