I never bleed this hard, my periods have been messed up and late for the past few months. Idk what's going on. I put a tampon in before coming to work this morning and about an hour later it's this full. When it was still in there was so much blood when I wiped. Is this

normal or?

Some info - I'm not on any medications, it's not like I'm new to periods or anything, I'm almost 20. I do have hypothyroidism but it's not bad at all.