Ok ladies, I need advise!

My period was due on sat 9/26 and still hasn't come! (4 days late!) I typically spot a few days before AF starts and nothing at all this month. I got a positive ovulation test on the 18th, which would make me about 11dpo. I've taken a few hpt and they've all been negative. When would you test again? I wouldn't typically be so obsessed but I'm never late! Has anyone had a similar experience and still gotten a BFP after 11dpo!? So confused and trying not to stress over it.