My endometrium was irregularly thickened on an ultrasound. My doctor then started me on birth control at the start of my period of January 14 and I was sent for another ultrasound on January 29. My endometrium was still sitting at the same thickness. Is this due to the birth control? I haven’t stopped bleeding on birth control and it’s not February 10. On February 8 the bleeding has gotten a lot heavier? Is this normal?