Aside from the issue of flushing during pregnancy, if you recently had surgery and a transfusion you need to be focusing on replenishing rather than cleansing. Cleansing and replenishing should always be alternated so that you build yourself back up...and with extensive blood loss in your case it may be safer to stick with a very healthy, nutritious diet and wait on any cleansing until you are fully healed. You could probably try a the slow method of cleansing your liver...1-3 Tablespoons of olive oil followed by a glass of water with juice from a lemon every morning. Also, using psyllium fiber daily will help to remove some of the bile acids, too.