So confused! Opinions pls!

Crystal
My husband and I have been trying to conceive for a year now this month. I have been using OPK's so I know I ovulated the 13th. I had some light brown spotting 3 days ago (9dpo) only once at work. So later that evening I decided to take a test just because BUTTT I got a vvvfl! I tested again yesterday morning and it was negative. I called my OB and I explained and she ordered blood work which came back negative! Ughhh I'm so confused! Has anything like this happen to anyone else and still got a BFP?  
Picture is the vvvfl I got 3 days ago. My period isn't due until 3 days.