Well, I called my OB's office and talked to his nurse about the concerns about my lining. She basically told me that at my age (43), I might have some variations with my lining thickeness due to hormonal fluctuations, but that it's not worrisome for health reasons if I'm not having any other symptoms, ie. regularly bleeding between AF's, heavy, long AF's, etc. She also said that at the middle of the LP (1 week before AF, the lining can be quite thick and that 14-17mm may not be that unusual at all at that point. I never had a base lining measurement earlier on in the cycle either, so I don't know what it started out with. For all I know, maybe my lining's always this thick at this point in my cycle, so maybe this has always been normal for me. I don't know cause I've never been measured before.
She told me that if I'm still not pg by Sept AND/OR I start having bleeding issues, then I'd need to call her back and they'd do some more measuring (before O and after) and/or other tests, if it's warranted.
So, bottom line is, if I don't have any suspicious symptoms and I'm still very premenopausal, chances are there isn't anything serious going on (ie. cancer).
If it's the beginnings of endometriosis or something like that (which I dont seem to have symptoms of either), then we'll deal with that too. But, at this point in my life, I'm not going to go through anything drastic to get pg...if it's meant to be, it's meant to be, if not, then so be it. I'm beginning to be at peace with whatever is meant to happen.
Thank you for all your concern though and for your looking out for me.