If you want to learn more about your body i say bbt is good, but doing it to ttc i say no, stick with the opks(unless you dont no
for sure if you are ovulating) hey, try it out
for a month, take your temps and use the opk, then compare your notes, see if 1-2 days b4 you ovulated if your temp decreased, then check the chart to see if 1-2 days after you ovulated if your temp increased. Then watch the temps rise over the LP and as it comes to an end watch if fall the AF arrives.