When to take a test..HELP??

This may sound like a stupid question but, my husband and I have had unprotected sex like twice after (I think it was my menses ) my period which ended 5/29 (super light spotting throughout). We're trying to have a baby but I have no clue as to how soon to test. Do we wait 1-2wks after the initial unprotected sex date or do we wait till my next missed period which is also hard to judge because I'm very irregular.