I had a blood clot in October and I've been on coumadin ever since. When I was in the hospital for the blood clot, they made me stop my birth control pills. It took forever to get an appointment with my gyno to discuss new birth control treatment, and once we found one, it has taken another 4 weeks to get it in from the pharmacy. I went yesterday to get my birth control under way and I took a prego test before getting started. It was positive. What danger am I facing now that I found out I'm about 4-5 weeks pregnant and I've been on coumadin? I know it can cause birth defects, but what kind of chance do I have of being lucky?