Oh Felicia sweetheart, I feel for you!! This TTC is such an emotional rollercoaster and no matter how positive we are most of the time, sometimes it just hits when things don't seem to be working :-(
Don't put too much pressure on yourself, know that the low day will pass, head under the blankets or not, and that tomorrow will be a new day with a new outlook. You are doing everything possible, so hang in there, it will happen. I know how you feel about losing trust in your own body - how was my lack of trust last week - I was certain that I was going through menopause and my body had totally let me down, and I was actually pregnant...
As for me, I tried the OPKs, I think I got a kinda sorta positive, but they just confused me. So like Kara said the only really good thing to do is just have lots of lovely sex and leave your body to it! I had no ovulation signs last month, no ewcm, no ovulation pain, no spotting, a possibly positive OPK, but not really sure, and I fell anyway. So keep on doing what you're doing, and tomorrow will be different.
Lots of love and hugs xxxx