Very heavy

So I'm on Yaz and have been on it for 4 months and people say that their periods are practially not there when they are on it. Well yesterday was the last day of the White pill so my period should be ending soon or so I thought but this morning I woke up and I was covered in blood form a super plus fampon that was in for only 30 minutes!! My super plus tampons can only last 15-25 minutes is this normally with Birth control I went to the doctor and he was no help. TIA 🌷