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When looking for pregnancy weeks information you should consider both your development and the development of the baby. This is because if you use the pregnancy week calculator you will feel like the changes happen from one day to the other and it is always good to know what the next day will surprise you with. Some women like the surprises that pregnancy brings, but others prefer to know what to expect during pregnancy weeks. This also includes knowing when you will have the appointments with your doctor and the first ultrasound.