Why does my uterus hate me?

Hi guys. Usually I’m someone who gets their period for 4 days (a light period) but it’s a little irregular on like coming monthly. Anyways, last week I got my period for about 7 days and it was pretty heavy. I was kinda scared but it went away after seven. 4 days later it came back really really heavy. I’m still on it now and it’s nothing like my normal period. Is this healthy? Is this normal? 😳