Unusual heavy period

Karisma

I used to have pretty heavy periods, but never heavy enough to bleed through multiple tampons! I take iron, and that has seriously lightened my flow considerably. However, this cycle I have bled through a tampon at work, again overnight; and AGAIN today! There are no clots, but my cramps have been worse than normal as well. Anybody have any input on why this might be happening? I’m not TTC, I’m on the pill!