Flonase during pregnancy?

This might not be a controversy but it seemed the most legit place to ask, lol. I have ridiculous allergies and I just found out I'm pregnant. Flonase is rated a C for pregnancy because it hasn't been tested enough during pregnancy. My dr said it should be totally fine, but I feel like I shouldn't risk it. Has anyone used it and any bad reactions?  I don't think one spray in each nostril daily could even make it to my bloodstream but if there is a chance of danger, I will figure out something else. Oh, and I already use Claritin and Benadryl, they're fine for pregnancy.