i if i were to guess cause i didn't see it. i would say its your mucous plug. it can sometimes be bloody or have streaks of blood. perhaps look it up and see if there are pictures online you can compare it to.
means your body is getting ready for baby to come...doesn't mean tomorrow, just means your body is getting there.
best of luck! glad to hear baby is okay.
yes i agree, still go in, especially if you were contracting last time as they need to monitor that... did you show them the mass that came out? if not definitely do this time and really try to get them to give you an explanation of what is causing these... ive never heard of this before and i wouldnt excuse it because they sent you home last time... you need answers incase this is something more serious...
I have no idea what it is, when I first started reading I thought placenta, but obviously this couldnt be it, I would go back to the hospital, and if you still have what you passed, take that in, even if baby is moving etc I would still go in as this is def not normal and I would err on the side of caution, all good if your sent home, but its much better to have both yourself and baby checked again as this can change very quickly