Hi, guys! I'm just helping my sister who just got pregnant. This is her first time and she is not yet seeing an OB. Her mother-in-law was telling her the other day that it is too early for her to see her doctor and for sure an ultrasound will not be performed at this early stage. She is just 8 weeks pregnant based on her last menstruation. She is so excited and she wants to know her due date but I really dont't know how to calculate it manually, lol. I told her to check for an online pregnancy calculator but I am not really sure if it is accurate. Have you tried it? Please feel free to share opinion. Thanks!