If I had unprotected sex march 28 would I be 9 weeks an 4 days today June 28

I count 3 months... 12 weeks... or am I missing something here?

I count 3 months....12 weeks...or am I missing something here?

I know I had a ultrasound yesterday an that's what they told me

In the medical profession we go by your last monthly period, not by the day you had sex.

Is paternity in question?

Yes

I count 3 months....12 weeks...or am I missing something here?
Thank you

I would listen to J9 on this one... she is the expert on this topic.

Since paternity is in question you will need to wait until the baby is born to have a DNA/paternity test done. Gestational dating is highly subjective with a large margin of error.