2 doses of Cytotec + D&C failed! Seeking advice

J
After my missed miscarriage at 10 weeks I was given 2 doses of cytotec. I passed a lot of tissue and what I believed to be the sac. 2 weeks later I found out tissue still remained and promptly scheduled a D&C. 3 weeks after surgery I'm being told the D&C was incomplete as well, and my body is clinging to this pregnancy tissue. Doctor is now putting me on birth control to try to regulate hormones and pass the rest naturally. I am so ready for this nightmare to be over! Has anyone experienced or heard of this? Did birth control work?