Ask about due date

my doctor appt is in mid of may. i want to know about my pregency week. my first day of last period is 13 feb. i testes pregench test on 20 March but the result is negative. but i retested on 20 April again and showed positive. so how to calculate the due date? thanks

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Super Mum

Congrats! You should add 40 weeks to your last menstrual date & that should be your due date. When you have a detailed scan it will tell the due date more accurately.