symptoms?

Ovulated on the 6th 
Spotting 8-10th (light pink only when wiping)
Since the 10th I have a backache constantly
Some small cramps in my stomach 
A headache most of the day
Stomach is tender mostly in the morning
Nauseous and tired the last two days
Took a cheap pregnancy test yesterday but was negative 
Period not due for 2-3 more days