early first response Pregnancy test

hello i got a couple of early pregnancy tests which i can do today (up to 6 days before expected period) <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> says my period should be here the 15th. i am just wondering/ have a question about pregnancy tests.. can i use this test next week also? even though it will not be 'early'. sorry if this is stupid but i don't know