I am not sure what would be happening with your menstrual cycle due to your use of ECP etc. The best bet is for you to visit a GP and have a chat with them about your dosages and discuss what form of contraception best suits you. It may not be the pill and there are quite a few options which may even be easier than the pill in your case.

The doctor can also organise for a blood test which gives a much better result on what is happening both with your hormones and whether you are pregnant or not.