Yes, temp drops are normal especially right after AF is gone. As my dr. told me after my last m/c, trying to conceive is a little more than just sperm meeting egg. The egg has to implant correctly and most early m/c are caused by chromosomal anomalies. Its very possible to see a faint line early on on one hpt and then nothing afterwards. The percentage may seem staggering but 15% of all pg end before the first trimester. Its only after the first trimester is over with that the precentage goes down to 1%. And every time you conceive those percentages stay the same. I think your chart looks completely normal and I hope you O very soon! Good luck this cycle catching your eggie!