very long period after abortion

I had an abortion this june, it was the 6th or 7th I think. So I got my period on july 21 and it hasn't stopped since then.

I also started taking the pill again and a friend told me that could be the reason cause it happened to her too.

But her period was only 13 days long and I've had mine for almost 4 weeks now.

I'm kinda worried by now and I wondered if it could have smth to do with the abortion maybe?

Has anyone had a similar experience?

Is this nothing to worry about or should I see my doctor?