Hi there ,
Thank you for your reaching out & for your question. Personally, I have experienced clotting. While we cannot share medical advice as we are not qualified healthcare professionals, that being said, I recall my doctor telling me that clots can be normal (if smaller than a quarter I believe) during your period, but anything causing you to change your tampon or pad every hour or so, prolonged days, etc. should be further evaluated... it is always of course a good idea to discuss with your doctor in order to rule out anything more serious.
Do you find that this is regularly happening for you?