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Pregnancy stages: week to month and trimester conversion chart
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Pregnancy stages: week to month and trimester conversion chart

This chart shows clearly how do weeks, months, and trimesters of pregnancy line up with each other.

As one shall see, the first trimester includes months 1 to 3 of pregnancy, while the second trimester includes part of month 3 until month 6. Finally, the third trimester is the final stage of pregnancy, which includes months 6 to 10.

By BSc, MSc (embryologist), BSc, PhD (senior clinical embryologist) and (invitra staff).
Last Update: 10/30/2017