Need confirmation on pregnancy date.)

Her last period was on Dec -05to 09 2022 (no periods on Jan,Feb,March ) And we had unprotected sex on November 29 the next time we had sex on Feb 5 and on 6 th March we take the pregnancy test it's positive 7 th March we go for ultra sound scanning and the GA (AUA) IS 6 WEEK and 1 day and we did the beta test also same time and the result is 44356 HCG the doctor said its GA is 7-8 month so i need the clarification how is it possible, if she got pregnant on the Feb intercourse this should be her 6 week if it's on Nov intercourse this should be 12 th week but from where this 7-8 week. Medication we took only duphastone 10 mg 5 day course from( 1 March to 5 March ) and one time we took an ipill also in the middle of February Please clarify about this Please find the attached files of beta report and scan copy (i don't have the report scan )