Estrogen dropped a little - should I be worried?

I had a FET on October 7th and have been on estrogen patches plus taking estradiol pills.  On Saturday my estrogen was 900+ so they said I could go from 3 patches a day to 2 patches a day.  My estrogen level today (Monday) was 700-something.  They said they will retest me on Thursday.  UGH.  I should be 6 weeks 5 days pregnant.  Should my body be making enough of its own estrogen so that taking off one patch would not make the estrogen level drop???  So bummed, I just want to get good news from now on and be able to quit worrying and start enjoying being pregnant. :(

Please, if anyone has experience with dropping estrogen levels/similar situation, I'd love to hear from you.  Thanks.

[Allip77]

Correction:  I should've not said "estrogen dropped a LITTLE."  My nurse actually said it was NOT a little.  She said my progesterone drop was a "little" - from 29-24.

[Allip77]

I just wanted to say that everything turned out fine.  Estrogen went up the next time.   (just in case anyone was searching for this topic because they're in the same situation...I hate it when that's happened to me and I never knew how the person's situation turned out!!)