I went to ultrasound scan today and according to my last period I should be 6w+5d today. My cycle is very regular! The doctor who did the ultrasound did see the fetus and a bouncing heartbeat but couldn’t measure as it was too small. She thought I wasn’t more than 6 weeks and is going to do another scan in 3 weeks. I couldn’t see anything other than a sac and I can’t help being a little bit worried :/

How common is it for egg to “hypernate” after fertilization?