Erratic Temps

So, I started temping this month beginning on cd 4 and am now on cd 10. So far, this is what my temps have been.

Cd 4 - 97.45

Cd 5 - 97.84

Cd 6 - 96.89

Cd 7 - 97.04

Cd 8 - didn't temp because I took some nighttime cold medicine and I was dead to the world

Cd 9 - 97.04

Cd 10 - 97.84

From what I've read, temperature shifts are usually only about +/- .5 and the shifts are only supposed to occur right before and then right after ovulation. Can anyone provide me any insight into why my temps are all over the place? Anyone have similar experiences?