Frustrated!

I called the dr. this month to find out what to do about the spotting I have had every month TTC since my D&C in July.  She sent me for a progesterone blood draw at 5 DPO , which came back at 12.5 - apparently that's low.  So while it explains the spotting, it still leaves me frustrated, because now I am assuming that AF will come this month (even tho this month has had no spotting at all - I am having acupuncture 1X/week and am drinking all the herbs and taking all the vitamins).  I am SO tired of spending so much of my time every month with charting and temperatures, herbs and OPKs.  Now they want me to start progesterone suppositories - and I'm not entirely sure whether I should do it, or wait for the acupuncture to continue regulating my hormones (which it definitely seems to be doing).  I just wish I knew if I should keep on trying every month - or if I should just give up at this point and enjoy the 2 children I do have.  I'm 38, so I don't feel like I have the luxury of taking a month off.  I know that none of us have a crystal ball, or know what God's plan for our lives is - I just wish I could figure out what my path is supposed to be!