My 1st month TTC

Andrea
I got off nexplanon on the 13th of October and got my period on the 14th . I'm 24 years old getting married in 3 days ! (So nervous)  I've been taking my prenatals and all. I'm  a little scared, I never realized how hard it is to get pregnant until I got this app . A lot of people take a while to get pregnant .. Or after years and are still trying . I'm scared that I'll be very heart broken when (if) aunt flow comes in a couple of weeks and this will just become a stressful pressuring thing for me . 
My soon to be husband really wants to start a family and has been asking me for the past year but I wanted us to wait until we got married . I'm not sure of when I should test, I already have a packet of the (E.P.T) my next due period is on the 12th. I'm so anxious to open up one and take it but I don't wanna get heartbroken.