Hello There! I Noticed Pinkish Discharge Sunday The 3rd. It

Hello there! I noticed pinkish discharge Sunday the 3rd. It was odd because my period isnt due until the 13th. That discharged stopped and then resumed on the 6th. I only noticed the discharge when I wiped until a little later that night when a super light light light flow came. Just like drops on an ultra thin pad. Normally my periods are extremely heavy so this has thrown me for a loop. That light bleeding lasted 2 days then vanished. Then i saw the pinkish discharge again on saturday the 9th. My boyfriend and I did have unprotected sex during my ovulation period which I believe was the 27th thru the 31st. I took a pregnancy test yesterday and got a negative result. Could it be too early to test? Can I be pregnant?