when to test?

Jenn
Hey ladies. I was diagnosed a year ago June 16th and we have been ttc since November with an early loss in January. My next period should be in 6 days. I'm really struggling with wanting to test early. When do you think I should test? Wait until I miss a period or test before? I've had 2 unexpected lows in 3 days and my boobs are killing me. But those also present themselves when my period is coming.  Not sure what to do.