I am not sure what that is, but it does not look normal at all. if you saved it, i would show it to a doctor.
it looks like tissue(skin not toilet) clots usually looks like liver and brake apart easily as above said i would show a doc it you saved it
i just looked at the other pic, i had miscarriage last night and it looked very much like that(http://i4.photobucket.com/albums/y112/Alexisyogirl/0103111056.jpg) i was 10+3 but baby only grew to 7 week and mine was around that size too i would agree with your mum on that it does look like u have miscarried
I tried to talk to my doctor about it and they said because i didnt have my period that maybe it was uterous lining but they never bothered to look at it and everyone who does see these pictures all tell me it looks like a miscarriage..