Blood clots still after birth of first child???

Amber
Ever since I had my first child over 18 months ago I have passed blood clots with every single period I have had since. I just want to know if anyone else experienced this or has this problem after their first child? My periods are still regular and come on time but now they are heavier, longer, and I have lots of symptoms and cramps with mine now. I know periods change after having a child but I didn't think blood clots were normal. I only notice them when I use the restroom. They are basically every time I use it and they are about the size of a quarter sometimes smaller. Is this normal or should I be concerned?