19 week miscarriage in january.last period on 3/15.ttc on 3/18.spotting and cramping then passed 3 inch brown tissue no bleeding after.miscarriage?

Miscarriage: It does sound like a possible miscarriage. I know how frustrating this can be when you are ttc, and when you have more than one miscarriage, it is best to consult with your gynecologist to evaluate you for possible "antibodies, " such as the so called "lupus anticoagulant ( which is a misnomer, but that's what it's called), " which can interfere with fetal development.