First period after biopsi

first of all let me apologise in advance for the details in this post.

So today is the 1st day of my 1st period after having my cervical biopsi I believe it was the loop method.  I haven't really had period pain on the lead up, I've been bleeding constantly since the biopsi and the only reason why I know my period has started is because I'm a lot heavier today.  AnywayI've just got home was stood talking to my b'friend and I felt something slip out of me, I went to the bathroom and there was a massive blob, probably the size of a newly hatched chick in my knickers.  I'm guessing it was congeald blood or blood clots.  Is it normal for this to happen?