Fellow TTC'ers.. Need your input!!!!!

Tulips26
I need your help advice opinion experiences whatever it is . Would be appreciated. Have you ever tested negative on a 6 Day sooner First Response test then test positive BFP a few days or week later??? What's your experience please!!
Hx:
I Have an average 25/26 day cycle
Last period April 19-21
First time TTC'er via IUI
All pretest and hormones and egg reserve good)
Clomid CD3-7. (Two 50mg tab daily for 5 days)
3 follicles 18x21; 19x20; 16x17 (April 30th)
Ovidrel injection (9pm sat april30) CD12
Ovulated anywhere between (CD12-15; 4/30-5/3)
IUI at 0730am 5/2 CD14 ( they didn't do US to see if they grew larger or had more follicle since injection) 
I've tested the trigger out .. I was getting positives up until CD8. Trigger completely out my system. 
Now in my TWW and been getting negatives since.. Experienced mild cramping on and off since IUI. On and off sore nipples and breast ... 
The doctor said I did ovulate and my progesterone was 13 as of Monday
Today is CD 23 .. Negative test
Ain't Flo due in 3 days (April 14)
According to the calculations , I could have implanted CD21-23) if fertilization occurred.
Is it still early or is it looking like. No.  I have a strong faith in God and I still have a good feeling about it. The doctor says I'd I miss my period Saturday come in Monday or Tuesday for a blood test.. I'm praying I'm just one who gets a positive late at this point. 
What's your take... Please comment. I'd like to hear your experiences and opinions 
 

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