Thank you for posting your question here, I will try to answer it to the best of my abilities.
Some women sometimes pass blood clots
during their periods and it is nothing to worry about. But in most cases it is something to worry about, as blood clots could be caused due to miscarriage
, fibroids or hormonal changes in your body
So it is a good thing that you booked an appointment, these three things are probably the first things they will check and after confirming the diagnosis treat you accordingly.
I hope this answered your question.