Period or something else

Sa

I started my period a couple days early last night, which my period has been on a regular schedule for months, starting and ending on the same day so I was a little surprised. And it also didn’t start like normal. Usually it’s like spotting for a bit with brownish reddish blood but it was bright red blood. I also had a foul smell a couple days before it started as well. I woke up this morning and my lower back is hurting very intensely and I’m bleeding intensely. I never bleed through my pads and I did this morning which never happens. And before I could even get another pad on I just kept bleeding down my leg. There’s been more blood clots than normal as well but they’ve been small. I have also been cramping way more painful than usual. Now I’ve been under a lot of stress last couple weeks so I’ve been thinking it’s that but I am sexually active so I’ve been worried that it could be an early miscarriage. Any thoughts? I’m not really sure what to think of it.