Tissue in uterus after miscarriage?!?

Chalese • Wife & Mother❤ I have 2 beautiful girls(6 and 1). I have had 2 miscarriages and am currently pregnant with our 3rd girl!!!
It's been about 2/3 weeks since my miscarriage. I went to what would have been my first baby appointment for a follow up. They gave me an ultrasound to check everything and the tech said that there was some tissue still left on my uterus. I don't really know what to think about it.. Is it something I should be concerned about?!? She said everything else looks good and that my dr. Would call me after he reviewed the report..he may have me come back in.. Did anyone have anything similar happen to them? What was the outcome?