When to take a test?

Kathrine • Momma of 2🤗

We have been trying for 6 months to conceive and so far nothing each time I take that test I get my hopes up! I am currently 3 days late on my period and I'm afraid that maybe I'm testing to late cause I would test the day after I missed the first day of my period! Advice and thoughts would be greatly appreciated! Thank you all!