3 days late but BFN

Rocio

Hi everyone. I am 40 on my second round of clomid. I am now 3 days late but pregnancy test was negative :( Feel cramps but no blood at all.

I am using an OPK and I ovulate on the 14th day of my cycle. That means, if I am not pregnant, I should have gotten my period two days ago :( Anyone has experience that? Do you know why I might be late?

Thanks!