Don't worry, just don't think too far, get your bfp and then step at a time. I built lots of little weekly milestones in for my bfp after my 12 week mmc, and the dreaded 12/14 weeks went really quite quickly, use shopping trips with mates, lunch out, spread out appointments , like delay the initial docs one till later, midwife booking in etc .
Also just because you have had one or even two, there is no reason to think that it will happen again
I had bunged up problems taking the iron tablets, but found taking them on every other days better than the every day , (three times a day) that they said. Also most cereals are fortified with iron, these really made a difference with me after my iron was low from the mmc (had blood transufsions)
wishing you lots of luck when you start ttc again