Long periods...help?

So I went on birth control and my periods started becoming like 10 days. I told my doctor and she changed my prescription but it still is happening, what should I do? It’s only been two months on the new pill do I wait? My doctor said it takes about 6 months for your period on the pill to be regular. Also it starts the week before the placebo week 🤷🏽‍♀️