UPDATE: Brown spotting with little specks of tissue

UPDATE: I've been having brown spotting sometimes with specks of tissue since Friday. I go between being completely hopeless to "I'm going to be okay."

Many women have told me it's a for sure sign of a miscarriage.

Can anyone give me some reassurance?

Update: woke up this morning with no sign of any spotting! And nothing yet today! I think it may have been breakthrough bleeding, it started on the same day my period was supposed to. Second blood test tomorrow to see where my levels are!

Fingers crossed!