O'ing before CD10 isn't the greatest because your lining may not be built up enough to allow for implantation so early in a Cycle. It also may mean an egg that is too immature to be fertilized. That said, plenty of women have become successfully pregnant with an early O
However, what you describe, while part of the O process, may not necessarily mean you have O'd that early. O pain can be felt from a couple of days PRIOR to O, to during O, to AFTER O. And EWCM can be seen anywhere from a few days BEFORE O to even a few days AFTER.
I don't know your circumstances but the best thing you can do is to chart along with using OPKs. The OPKs will let you know when you are going to O, and the chart will let you see it happened. If you can't chart, then at least the OPKs. That should be enough to get you going.
HOnestly, if you've been with DH for 12 years, with only 3 pregnancies after trying, you may want to talk to your ob/gyn to find out if they can run some tests to see if they can't figure out why. And you may want to have your DH checked out as well. If what you are dealing with is infertility, you should know that infertility is split between men and women almost 50-50.
Once you have your answers, you'll know the best way to go about getting that baby girl!

Good Luck