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

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!!
I Have an average 25/26 day cycle
Last period April 19-21
First time TTC'er via <a href="https://glowing.com/glow-fertility-program">IUI</a>
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)
<a href="https://glowing.com/glow-fertility-program">IUI</a> 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 <a href="https://glowing.com/glow-fertility-program">IUI</a>. 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