HELP !

i had a miscarriage june 30th and we've been trying ever since i just took one today because i just had a feeling to just take it but i am suppose to start my period in 7 days i know you're suppose to take it after but i don't know what to think of it i dont want to get excited bc i did have a miscarriage and i made an appt with my obgyn. on sept 12 is this normal?