HELP! Took Klonopin - might be pregnant?

I would absolutely give your doctor a call. Stopping any medications abruptly without his or her say so could cause side effects not healthy for you or your pregnancy. I would say since it was so early on in your pregnancy that there might not be any repercussions. Many women engage in "risky" behavior before they realize they are pregnant. I know I had a beer when I would have been about 4 weeks pregnant, but didn't know at the time that I was.