I think the Dr. missunderstood my question I had wrote previously. Actually I have a problem with who I think the dad of my baby might be? I started my period on Dec.2 I finished it on Dec.7th I had sex Dec. 7th like at 12 AM then on Dec. 16 & 18 with a different guy from the 7th. When I went to my Dr. to get the first ultrasound it was made on Jan. 14 it showed i was 6 weeks & 1 day so did the wheel she said the dad is the guy I had intercourse on Dec. 16 & 18 should I still have doubt?