Please do some research on caffeine consumption during pregnancy. Do not do any cleansing during pregnancy. It's not a time to be pulling toxins out of the tissues and liver to be circulating around in the bloodstream that is supplying the fetus. The best time to cleanse is before pregnancy. Be sure to note the list of herbs below that you should NOT take during pregnancy.
Moderate exercise is very important for a healthy pregnancy.
Walking is one of the best exercises. You can read about it below. A great drink to use during labor is Liquid Chlorophyll. It keeps the energy up during labor and nourishes the blood since there is some loss during delivery. Free of artificial colors, flavors, preservatives, sweeteners, sugar, yeast, gluten, lactose, milk, soy or wheat so you can use it with complete confidence.