Hi can you tell me when does a woman start to show that she is pregnant. My family does not that I am pregnant. My boyfriend and I are 24 years old; we are planning on keeping the child, and getting married soon. I still stay with my family. We were planning on buying a small apartment, at the moment I am 3 weeks pregnant. Can you please tell me when will I start to show during pregnancy? does it differ prom woman to woman. Approximately by which week does the woman start to show. I am just wearing loose T-shirts just in case.