Normal estradiol levels in early pregnancy?

Hi there,

I'm about to turn 41 and finally, after lots of work found out I'm pregnant a week ago (natural conception, yes)! I'm 5 wks at this point, beta levels were rising normally. Initially progesterone was a bit low at 12, but was prescribed shots and yesterday's reading came back at 35! so hcg and progesterone look good. My question is about estradiol, I haven't been ablle to find anywhere what are normal estradiol levels in early pregnancy. A week ago my level was 280, my Dr put me on estrace but I had an allergic reaction (probably the blue dye) so I couldn't take it anymore, yesterday's level was 450. They will continue to monitor it. I know progesterone is more important but I'm still concerned about it

1) what's the role of estradiol?
2) what are normal levels at this point?
3) any experiences to share?

Thanks much!