Need advice!!!! 😒

So I take continuous birth control pills because my gyno said my periods are so bad that I just shouldn’t have one. Therefore, I am supposed to never have a period. Birth control is a steady stream of hormones right? Well, I started getting a period a couple months ago AND i am having white discharge like you would if you have a cycle. Wtf? My period lasted 3 weeks the first time even on birth control! I haven’t missed a pill, taken one late, and I’ve been on the pill for over a year. I am currently 17. We went to the gyno and she ran all these tests that I knew would come up negative! And guess what? THEY DID. I went there for nothing, and I thought it might be because of a hormonal imbalance or the pills aren’t working anymore but she said that ain’t possible because he pull is a steady stream of hormones. So the question is... do I go back to the gyno or not? I’m getting frustrated with the discharge and periods while on the pill, but idk if she’ll do anything.