Af late

Ronalda

I’m 4 days late with AF and I’m not sure what to think. I thought I was ovulating 2 weeks ago which is when hubby and I BD. I took tests but all BFN and I’m annoyed because AF is like clock work to me. Now I’m thinking I was ovulating last week when I had cramps on my left side and AF will be late this month. Do I still have a chance?