When should i test?

Charlie • Hi everyone! Trying to conceive baby number one.
Im due to start my AF in the 26th so im wondering if i should test on that day or wait till my periods actually missed?
​Ive noticed a lot of women on here doing tests before they have missed their AF and i never even though to do that i was just going to wait till the first of June to test because that way my period will be missed completely?
​AF due 26th to 29th
​Thanks ladies