Are clots on your period normal?

Hi i was resently put on the pill by my doctor (Ava30) due too having passed out and getting bad pains while on my period this is the first time since being on it that I've gotten my period and I've gotten clots, one was about half the size of my thumbs nail and the other one was about 3-4cm long and about 1-1.5 wide, I used to hardly ever get clots, is this normal or should a seek medical attention?
Are clots on your period normal?
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