Well, don't stress too much, it's not good for you. If you didn't have problems the first time, it's probably unlikely you'll have problems this time.
My sister, at age 20 got pg, then years later had a m/c, then she got pg with my niece with no problems.
SSBD
side note - I don't know alot about BBT, but my understanding is that it can take several months to notice a pattern in your temps.
I just started taking my temp it's been 97.8 I haven't done the opk I didn't have a problem getting preg the first time. It happened first month I tried but I want to be preg now. I'm going to keep up better if I'm not preg now. I just don't know what my body is doing.
I wish I could help, but I don't know anything about using a microscope and ferning patterns. Sounds complicated! Are you using anything else, like BBT or OPK's?