Failure on Two Fronts

So my body will occasionally plays tricks on me.  I have experienced nearly every pregnancy "sign" over the past 5 years to no avail (the internet is very dangerous that way).  I am very regular and other than the first cycle I was on Clomid I have never had a cycle last longer than 28 days.  Last winter (or it may have been the year before) I got all excited on day 28 when the coast seemed clear then right before I went to bed--boom-- dreams (as short lived and lofty as they were) shattered and my heart broke for about the bazillionth time.

Today was cycle day 30 and I was reminded for the 70th+ time or so that my body, in fact, does not seem to be able to do what it was designed to do.  I am wiser this time and began praying two days ago that I would need God to be there for me if my being pregnant was not His plan.  Thankfully, He showed up so there was no heartbreak this time.  However, there is a realization that I don't know how much longer I can go on being a "failure" on two fronts.

First we have the pregnancy front.  I have "the data" to back up the fact that I ovulate faithfully each month and that my lining is good so an embryo should stick.  However, without a $15,000 IVF procedure, we will never now for sure if my eggs suck or my uterus is able to provide anything other than an eviction notice.  We keep trying and my body keeps letting us down.

Then we have the adoption front where we have done everything we have been guided to do (with the exception of personally handing out adoption cards--I just can't seem to get there) and each monthly status update reminds me that they "have an adequate supply of profiles" and that no expectant parents wishing to pursue adoption feel we are the right choice for raising their baby.

I  know God has a plan for us and I know that His plan will be greater than anything I have imagined, but in the interim I am struggling and growing tired of being reminded on a regular basis that I am not worthy.

The question has been bounced around whether we should give another IUI a try.  Initially, my thinking was "I don't think it is going to lead to a new outcome, but what the hell, it couldn't hurt".  However, the month after month reminder of trying and failing is draining and I am beginning to wonder if, for my sanity, I need us to shut down the pregnancy front and stop actively TTC.  I don't want to be the quitter or a disappointment, but I'm not sure what else to do...