really basic question but do periods get lighter on BC???

I’ve been on junel 24 since the end of June 2018.

And at first it was heavy but now , I don’t think I bleed a lot lol.

I was on junel 20 before that. And I bled a lot more on that during the placebo week (that has 7 days of placebo while Junel 24 only has 4 days of placebo)

This is supposed to happen right, it gradually gets lighter on birth control ???!?