Anyone experience cytotec not working??

I lost my pregnancy at 13 weeks and had a d&c on 12/26. Since then I have had abnormal bleeding every two weeks since the d&c and until a few days ago still tested positive on pregnancy tests (it was finally negative yesterday). Since I was having abnormal bleeding my doc though there might be some residual stuff left so I was started on cytotec yesterday. I have taken 2 doses and nothing has happened. I have had absolutely no bleeding I just feel like crap. I’m waiting on the doctors office to call back but just wondering if this has happened to anyone else?