Only .3 BBT Rise...normal?

Nikki
I know I'm being overly paranoid but my temps only rise .3 from 97.4 to 97.7 with a couple days at 97.9. I've read anything from .2 to a full degree rise is normal but I'm afraid such a small rise could be a sign of weak ovulation. Does anyone have experience with this? Am I worrying over nothing? Thanks!