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Depending on where you live, trimesters may vary. If your country is not listed below, make a post in this thread and we'll update
First Trimester
US & Canada: Conception > 12 weeks
UK: Conception > 13 weeks
Second Trimester
US & Canada: 13 > 28 weeks
UK: 14 > 26 weeks
Third Trimester
US & Canada: 28 weeks > Birth
UK: 27 weeks > Birth
In the interests of website standards, BabyandBump.com starts pregnancy from the first missed period and splits 40 weeks of pregnancy into 3 equal sections:
First Trimester Forum: Conception > 13 weeks
Second Trimester Forum: 14 > 26 weeks
Third Trimester Forum: 27 weeks > Birth
First Trimester
US & Canada: Conception > 12 weeks
UK: Conception > 13 weeks
Second Trimester
US & Canada: 13 > 28 weeks
UK: 14 > 26 weeks
Third Trimester
US & Canada: 28 weeks > Birth
UK: 27 weeks > Birth
In the interests of website standards, BabyandBump.com starts pregnancy from the first missed period and splits 40 weeks of pregnancy into 3 equal sections:
First Trimester Forum: Conception > 13 weeks
Second Trimester Forum: 14 > 26 weeks
Third Trimester Forum: 27 weeks > Birth