10 DPO BFN

Hello ladies, I would like to get some input. I got a positive OPK on CD16 don’t know exactly when I ovulated but my guess is about a day or two after my positive (CD17/18) which would put me at 9/10DPO today. I normally have a 30day cycle my period should be in about 4 days. Am I testing to soon or should I have got a positive by now? :( pls let me know your thoughts!!