hi, I cannot say for sure if what you used caused a MC I can only tell you I am dying here from what I think is a yeast infection I am 10 DPO and I went to get something and all of them said, contact MD if pregnant. SO needless to say I did not get anything and here I sit suffereing, I say, What happened was meant to be, and chances are it was not your fault, I am a firm believer in what will be will be, try to keep your chin up and sticky baby dust to you.
Don't blame yourself, dear. Most likely the problem falls with the ovum. Please don't blame yourself!