TTC and 5 days late

Erika
Hey guys! We've been ttc since October and once I quit taking my birth control my cycles went from 28 days to 30 days for November, December, and January and af went from 4 days to roughly 7-10 days. I'm currently on day 35 and no af yet. How long should I wait before taking test? I haven't really experienced any symptoms other than my heartburn being worse lately. Not sure if I'm bfp or just PCOS being a pain. Thanks for input!