If you're not sure, visit our Pregnancy Due Date Calculator to check how many weeks pregnant you are. In the first trimester, you may feel like an exhausted, nauseated ghost of your usual self.

The initial phase of pregnancy, the first trimester spans from the first to the twelfth week. It begins on the first day after you miss your last period, i.e. even before you take the pregnancy test.

Excess maternal weight gain in the first trimester causes foetal fat accumulation, increasing risks of obesity, diabetes, and ...