Advive please


When I was 10dpo I thought my period started. I had a little pink blood when wiping, that happened twice that day and I thought I was spotting before period started. 11dpo I had a little pink when wiping - just once. Then 12dpo I had some brown when I wiped.

Today at 13dpo I took a pregnancy test (clear blue) and it was negative.

Is this the start of my period? This is only my 3rd cycle since getting off birth control so am confused.

I was using opk's that's how I know how many dpo I am.