i too have had my experience with baseball sized blood clots. I was on the shot and about two weeks before it completely wore off i had the worse cramps of my life. so bad i went to the er. I garrived at the er and i had to wait a few mins then i felt like something was coming out of me!!! i ran with my legs pressed really close together. this is gross...but i sat down on the toilet and a baseball sized blood clot came out. I had no clue what it was. I knew i wasnt pregnat, i hadnt been sexually active in six months, and iwas only wearing a size three so if i was 6 months i would have been huge. so i ran out of the restroom told the doctor what happened they immediately gave me an ultrasound i wasn't pregnat. The best info they could give me was that the shot was too strong for me. It was my first time on the shot or any birth control. After that my doc put me on a low dose of avianne and i have been fine since.
i had the miren iud put in and before i found out it dislodged itself while on my period, i bled horribly, i would have to change my tampon every 10 minuets, and i was passing blood clots like crazy. i went to the ob/gyn today, and as soon as he seen me he said, i looked horrible and sad and exhausted. i told him i havent even been able to do anything other than give my daughter a bath, and put her to bed, because i felt so tired. when he done a pelvic exam, he said i was bleeding so bad that he wanted to take a cbc count, because i had lost so much blood in 3 days. but he still hasnt called me with the results. he said if my cbc is low that he is goin to send me to the ER right away to have a blood transfusion. All over, a Mirena IUD birth control. But now i am on the Paragard IUD, and so far my bleeding has began to slow down and i still have clots but not many and not as big as before. But i still have headachs and cramping.
the thing is I can't take anything with hormones in it. The NuvaRing sent me strait into the ER for chest spasms over and over again and all the other pills would make me vomit uncontrollably or bleed for more than 3 weeks strait or give me really bad jitters. So I really have to stay hormone-free.
I go in today for my pelvic exam to see if there are any cysts or tumors.
Maybe you did miscarry? I never heard anybody passing clots that big before. Maybe you should get off the IUD and try regular bc pills. Did you ever go the doctor??