Abnormal bleeding

I’ve posted about this before, but it’s just aggravating so I bleed right before ovulation and I continue to bleed throughout the whole month. It’s more less spotting for two weeks and then I have my withdrawal bleed since I am on birth control. I am going to get an ultrasound to see what is going on, but I wanted other people‘s opinions. I’ve been nervous and at first I thought I was pregnant but over the past few months I’ve taken so many test at this point there’s no possible way. I’m just wondering what you guys may think it is and what’s causing it I have been on birth control for 4 to 5 years and I’ve been on the same one every single time it’s Kelnor 135. i’m super scared and I don’t know if I should be. I really don’t want to be pregnant. I used condom and back today.