I remember I felt so confused about this in the beginning! Doctors always count from the first day of your last period, making a full pregnancy about 40 weeks, which felt like 10 months to me instead of 9!
For most natural pregnancies, doctors count from the first day of your last period, even though actual conception happens later. Since my IVF journey was different, the doctor used the transfer date to calculate, but they will explain your exact gestational age beautifully on your first scan.
Doctors use your LMP (Last Menstrual Period) to calculate weeks, which helps schedule your important scans on budget. Make sure you get the dating scan done in the first trimester itself as it's the most accurate and cost-effective way to fix your due date.
Honestly, just download a tracker because trying to calculate 40 weeks into months while sleep-deprived is a headache, haha! Basically, doctors start counting from your last period's first day, so you're technically 'pregnant' before you even conceive.
Usually doctors calculate from your Last Menstrual Period (LMP) and divide it into 40 weeks, not exactly 9 simple calendar months. When I had my C-section at 38 weeks, my body was ready, so focusing on weeks is always better than months.
I just count my months by the cravings I had, like month 3 was all about golgappe! But seriously, doctors count weeks from your last period's first day, so 4 weeks roughly equals one month.
