@CookieMonster sounds like a confusing situation! I think I can clear some of it up 🙂
Firstly, let’s remember that you don’t get a true period when you’re taking the pill. What you get is a withdrawal bleed when you stop the hormonal pills & take the week of placebo pills.
In a natural cycle (no pill), the lining of the uterus thickens to create a good place for a fetilised egg to grow. If you don’t get pregnant, the lining is shed, causing that monthly bleed.
When you’re on the pill, the lining of the uterus doesn’t thicken & you don’t ovulate so there is no need for it to be shed. When you take the placebo pills, the drop in hormone weakens the lining, but since it’s thin, it tends to be lighter than your natural period, and in some, it can even be totally absent.
If you’ve always had a withdrawal bleed and it suddenly stops, it could be a sign of pregnancy. But, that said, it’s can be normal for a withdrawal bleed to change over time.
If you’re not happy with pill, have you considered trying a different type of contraception?