Pregnancy symptoms

EDIT: Lutheal normally lasts 12 days

I had a miscarriage in April and have had a normal period since. I never get sore boobs before or during that time of the month. But for the past few days I've had sore boobs and constipated. My period is in 12 days. Has anyone had this that doesn't get anything genuinely and haven't been pregnant? Is it too early on to even get the symptoms? Should I wait until I'm due to test?