Hello, My Partner Recently Had A HSG And Unfortunately Is

Hello,

My partner recently had a HSG and unfortunately is showed her fallopian tubes are blocked so we are currently waiting to go through IVF. She has just had her first period since the test was done and there was a lot of clotting, but also what I can only describe as a long piece of spaghetti came out too. What do you think this could be?

Many Thanks