They start counting the pregnancy from the first day of the last menstrual period, which happens about 2 weeks before conception. So, when they say the embryo has been developing for 6 weeks, it has actually been developing for only 4 weeks. There is no heartbeat at the point they have written into their law; there is actually no heart yet. It was understandable to make these mistakes several decades ago, but now we have more advanced instrumentation that has turned these mistakes into fraud.