During your period, your body will release anticoagulants that keep the blood fluid and thinned. However, if your flow is extremely strong, the blood may pass before the anticoagulants can work. In this case, the blood may clot as it is passed.
However, there are times when blood clots should be a reason for concern. If you are passing clots that are bigger than a 50p on a regular basis, it could be a sign of something else.
In this case you should consult with your doctor immediately to find out the cause
so says google
but yeah > they are normal
least i hope so cause i get loads of them during my AF and have done since i was 13