I had an ultrasound and found out I was 4 weeks and 6 days pregnant when did I concieve my baby the ultrasound said 4 weeks and 6 days

The margin of. error for ultrasound is roughly +/- 8%(in days) throughout the pregnancy. So at 34 days by ultrasound estimate, it would be about +/- 3 days.
You . You most likely conceived somewhere around january 28th give or take a week. Remember that the dating from an ultrasound is pretty good but can be off by a few days either way. It's a safe bet you conceived your baby anywhere between january 21st and february 3rd. I hope this helps. Congratulations!