One thing that may be making your temps whacky is the vcariation in the time you take it. From what i know from doing it before my first pregnancy, to get accurate temps, you have to take it within 15 minutes of the same time every morning, and you should take it before you even get out of the bed, or anything. What I did, was when my husband's alarm for work would go off, I would grab my thermometer and take my temp while still lying down, under the covers, and I kept the thermometer on my night stand and a pen and pad right there to write it down. Then later I would transfer it to my chart that was on the bathroom wall.
See this article: http://www.fertilitycommunity.com/fertility/am-i-ovulatin...
"Specifically, you should use a basal body temperature thermometer, which is available at drugstores for around $5.00 to $15.00 and measures your temp in easily readable tenths of a degree. The first day of your period is considered Day 1 of your cycle; you will place an "x" on the chart for each day of period (not spotting). You may take your temp in any of the usual places (orally, under the arm, or rectally), making sure to do this for the same amount of time (around 5 minutes) each morning immediately after waking and before rising from your bed. It is suggested that you write down the results before going on with your day, to avoid forgetting it later.
Be aware that it is not uncommon for your BBT to be easily effected and influenced by a number of factors: physical activity, alcohol intake, amount of rest, medicines, etc. Therefore, it is important to make note of any and all of these factors when you are charting. "
Mine was more accurate/consistent after starting the procedure above, after the first month when I was taking them all over, time wise. I found out that I had actually ovulated on day 7 instead of 14, and my daughter always measured a week smaller on the ultrasounds than she "should" by their 14 day after menstrual period calculating method, but I showed my Dr. my charts and she said they were very good and accurate, and changed my due date by a week to reflect my own knowledge of my body!
So, anyway, I think you need to be more consistent on the time and method of taking the temp to get a more consistent result, that you can then depend on to better predict when you will ovulate after a few more months of charting.
Good Luck!
Jessie