When do i test?

Lu
My husband and I have been ttc baby #1 for about 2years now i just started <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> but had been using another one well last month i had my monthly period on the 9th so this month should have came by now I'm so anxious to find out if we have conceived this month really don't know what to do