November 28th had sex with husband, December 10th ultrasound check

Patient's question:

On November 28th, I had sex with my husband. On December 10th, I had a B check-up and found out I was pregnant for 40 days. Please tell me if I was in November

Doctor's answer:

Hello, according to the situation you described, this could be due to a detection error or a possible previous pregnancy. It is recommended that you have another check-up to confirm. Generally, there is no major issue, so please pay attention to rest and undergo regular prenatal examinations.