Too early?

I o'd on the 2nd apparently (Blood test revealed high pregestorone level)... Anyway, so I usually have a 32-34 day cycle. I've been having a few symptoms, emotional and extremely tired for the past 2 days and mild cramping off and on. A couple days before that I experienced some sharp pain in my lower left abdomen. I took an early response pregnancy test today hoping to get lucky, but it was a bfn. AF should start the 15th. Think there's still a chance that it's just to early?