Faint OPK tests?

Ceci • South Florida
Hello everyone, I am new to Glow but was part of a TTC support group for many years...took me over 2 years and $13k to finally conceive my first with INJ/<a href="https://glowing.com/glow-fertility-program">IUI</a>...second baby was conceived naturally...but for both pregnancies I had very faint positive OPK tests.  This time around I took pictures because I wonder if anyone else had the same issue as me and never got a dark positive.  I've used every brand of OPK, even the little machine and they've all been negative with no lines at all.  The 2 times I conceived I only had faint OPK's.  Here are my OPK's from this cycle...wondering if anyone else's look similar.  I had no lines on CD 9, faint lines on CD10, hen darker lines on CD 11, then no lines on CD 12, 13.  Any thoughts?  This 2 week wait is KILLING me!!  My cycles are usually 26-27 days long and today is CD 20.  Having a hard time waiting to test!  Both of my children were BFN until AF was due, then clear positives.  Sorry for the long post...the waiting is getting to me!