at how many days late should you start to test? what would give you the best results?

From the day of your missed period onwards. There are tests that claim to be able to test 5 days early but the accuracy goes down and they are still most accurate on the day of missed period onwards. Hope this helps!

I'm 10 day's late I'm always regular and i tested this afternoon and it was negative so maybe i tested to soon @halibug

Could be the case if you ovulated layer than normal. Maybe give 3 more days and try again with fmu

Thank you so much @halibug

first morning pee is best I'd wait 3-4more days