I would suggest not to hide a pregnancy. It is not good for your or your baby. If you are overweight you don't show as early, if you are underweight you could start to show sooner. My friend is underweight and showed at about 6 or 7 weeks. A girl I went to high school with didn't tell her family until she was 6 months, by wearing baggy pants and sweatshirts..Since she was hiding it she didn't take prenatal vitamins, and get proper care for her and her baby. She was pregnant with twins, one died in her and the other was very sick at birth. Since the other child died in her months before, she got a horrible infection and almost died. For your sake, and your babies sake please don't hide it. Anyways, if you think someone will be upset that will give them more time to accept the baby.