So DH and I won't be TTC until he gets home from deployment but I've recently begun charting my temps and reading Taking Charge of Your Fertility so that I can understand my cycles better and have a greater understanding of when the best time to conceive will be once we start trying. I've always been irregular and charting has given me a lot of insight so far. I bought a BBT thermometer from Target and after a month it started giving me the same temps for five consecutive days, so I bought a new one and it seems to be giving me favorite temps as well. What's the best BBT thermometer to use? Any suggestions?