TMI pic: Huge clots all day

These have been happening all morning, since about 7:30a and it's now 1:28p. I've passed anywhere from 5-7 of these and the biggest one was around 9am (about half the size of a tennis ball). There is some tissue in there too. I'm not having much cramping. I never took an hpt but a friend of mine said this is what it looked like when she had a miscarriage. Does anyone agree? I mean either way, there's nothing I can do about it now but tomorrow is my graduation and as the day is going on I'm feeling a bit lightheaded/woozy. Suggestions?