AF is 2 days late

Marion • German girl living in the US, married to the love of her life. First time mommy and owned by three Great Dane girls.
... But tests show BFN :( I feel like I am getting my period with back pains and cramping but I have had cramps a week after I ovulated. I don't know what to think. It's so frustrating. We've been TTC for a year now and after this cycle decided to take a break for a few months and then try again.