Question about Birth Control Pill?!

Question about Birth Control Pill?

Being the paranoid worrier I am, I was wondering if I should even bother taking my BBT (basal body temperature) in the morning. I just got my period last week but am for some reason still worried about pregnancy. My BBT this morning was 98.5 (after a few minutes of waking up and walking around)..but is this because of the hormones in the pill?

I've read sites that say not to bother using this method when you're on the pill. So should I just stop worrying since I just got my period last week and also had a low BBT then??

3 weeks ago
P.S. I have been using back-up the past month.

3 weeks ago
I took a pregnancy test last night (which would be ~1 week after my period started) and it was negative.

The pill is rather effective if you are studious in taking it. If you are really worried about pregnancy I would suggest a condom with some spermacide.