Hi all, Im 6 weeks today and just went to have my dating scan. at 7 weeks wait until 8 weeks:) baby should def have heartbeat by then:) I'm going in tomorrow to see my ob and hopefully get a scan to date the pregnancy properly. I am 7 weeks pregnant with my first baby, my GP sent me for a scan at. Find out what to expect from your 8 week pregnancy ultrasound here. Find out what the purpose is and what to look for. Your first pregnancy ultrasound scan is likely to be a dating scan. Find out The point of the scan is to work out how many weeks pregnant you are. You may.