BFP well after missed period?

Kayleigh
Hi all! Wondering if this has happened to anyone...
​My cycles are regular - either 26 or 27 days, always. Been TTC baby #1 for 8 months. Today is day 29 and AF hasn't shown up yet...BUT I got a BFN tonight. 
​Did anyone only get their first BFP a few days after a missed AF? Maybe even a week after? I'm wondering if I should hold out hope or be worried!
​Thanks!