pregnancy and asthma (and advair in particular)

OK, I would love to know what you all think of pregnancy and asthma,
and, in particular, advair. When I talked to my doctor about pregnancy,
he never mentioned anything about the advair that I use, but I have
recently been wondering about it. I suffer from mild but persistent
side effects and have decided to go off of it (I've been toying with the
idea of going off of it for a long time, now, but being pregnant is what
finally did it). My asthma is actually not all that bad. I don't
suffer from classic attacks, so IOW, going off of the medication won't
be like welcoming death, or something. ;-) Going off of the drug will
just mean that I'll get a bit more, uh, phlegmy (yeah, TMI, I know).

One thing I worry about, though: I just read that advair is a class C
drug, meaning that effects have been observed on rat fetuses, but there
are insufficient data regarding the effects on human fetuses (i.e. there
have not been enough studies done - and in fact, one page I saw claimed
that there were no studies done regarding this at all, but I don't know
what is true, and it's hard to judge fact from fiction when the official
advair site has nothing on pregnancy at all (or maybe that should tell
me something)). Now, I have already decided to go off of this drug, so
once the medication is out of my system, I won't have to worry. ;-)
However, I'm curious, and I would like to know if anyone has any more
up-to-date info about known possible effects of advair on a fetus.

Thanks!