Late period on fertility meds

Has anyone that has taken letrozole ever got a BFN on the day of their missed period but actually ended up being pregnant?

This is my second round and the first round I got my period exactly on cycle day 28 in the morning.

This cycle I’m two days late and I’ve had mild cramping for the past week and no AF but all my tests are negative... I’m just hoping for a miracle. Year 3 of trying 😩👎