Advice please!

Okay so I missed my period this month I'm 27 days late according to eve so I took 2 tests they were both BFN. Now my mother claims it was wedding stress because my wedding was the 19th. I've still not started nor am I showing any signs to starting soon. With that being said my husband and I have had unprotected sex 6 times the past few days which is fine because we want to have a baby, but I'm unsure how high my fertility window is or anything because I've not had my period. Anyone else have some insight? 😊