Advice please.

I’m 15 days late on my period. Usually 28day cycle and have always been regular.

All my tests are negative. I’ve rang the GP and all he said was “you’re telling me your period is a few weeks late, so it probably is” which I thought was abit harsh due to me being under the fertility clinic.

Where would you go from here?

And has anybody been this late and been

pregnant without testing positive?