I got sex with my bf last january 16 , 24-26 i had...

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Regarding your question,

Duration of pregnancy

Based on what you mentioned at your question, your sexual intercourse was in January thus your last menses was on early January thus at least you are more than 12 weeks gestation as the age of pregnancy in based on your first day of last menstrual period.

How to be accurate

You can do the following

• Blood test for quantitative beta HCG
• TVS for CRL
• BPD

You can also ask our other certified experts in various fields such as: Nutritionists, Lawyers, IT Experts, Therapists, Mechanics, Doctors, Handymen, and more.
Kind Regards