Big clots

Has anyone ever experienced heavy clotting on their period ....some time ago (maybe like 6 months) I noticed that on my second day my period was heavy to the point I had to change my pad like every 30 minutes and even changing my pad was a mess 😐 and I was passing a lot of clots never experienced a heavy period before and the last time I had clots was when I first started my period and they weren't that big fast forwarding to now I don't have that issue what could have been the reason why?