I’m 10 weeks pregnant I’m not sure who the father

Patient: I’m 10 weeks pregnant. I’m not sure who the father is. My doctor gave me a estimated date of conception based on my ultrasound. I’m hopeful it wasn’t that date. I’m hopeful for a date that is 5 days later than the day they gave. It has been stressing me out. How much hope can I have in the date im hopeful for that is five days past the date they are giving me?

Doctor: