hmmmm, well I know that it's meant to drop around the time of O, but that seems very low! I would probably check my thermometer if the temps went that low. Is it digital? It could also be because you have been sick.

I have a book which says that after ovulation it should go high because of a surge of progesterone and it'll stay high til if your pregnant, or drop back down just before AF. Though sometimes it does take a day or two for the temps to rise again, which is normal apparently. I would probably wait it out, have a look at next cycle or two, and if it does the same thing then check it out with a dr.

This probably hasn't told you anything you don't know though, sorry!