Has anyone had a successful first pregnancy with no prior miscarriage?

I am just curious because when you look up chemical pregnancy and miscarriage it seems like a majority of women do have the experience prior to their ultimate full term birth.

I am 4 weeks 5 days and have not ever been pregnant previously. Just curious if I have good odds of it being a viable pregnancy. Also, is it normal to not be seen at all until 8 weeks? That is what my gyno set up when I called. Thank you