Babydolllove

Hello everyone I have a question. My Dr gave me a prescription for femara but only at 2.5mg the last time i took it i took it at 5mg and i got pregnant the 2 time i took it now i worried that it might not work because it was a higher dose last time. I am quite upset about this because i told my dr thats what i took it at last time and thats what worked.