been ttc for 3 yrs, charted for approx 6 months when first started trying, temps were all over the place and was not clear when ovulating (had a young baby at the time so never had undisturbed sleep!). Have started charting again, this month is the first, and although temps not as erratic as when did it few years ago, still not clear when ovulating (have had tests done so know that am ovulating). My understanding is that the temp shift is supposed to be at least 1 degree higher than previous 6 readings, this happened on morning of day 12, reading for day 13 was still higher than previous 6 but then since then temp has come right down even lower that previous readings, what does this mean. Have had undisturbed sleep for last couple of days as ds is poorly but thought the temp would go right up when this happens. Can anyone explain if it sounds like temp shift did happen on day 12 and why temp has come down since then as I thought it supposed to stay up.