I *did* do a google search when I had sinus stuff early in this pregnancy, and at that time, the Safe Fetus and other sites listing drug safety information for pregnancy didn't even LIST the the drug that's in the PE. So that was no help at all!
Also, an OB would be more likely to know about specific drugs for pregnancy, since afterall, that is their specialty - pregnancy. If you ask the pharmacist, they'll just tell you the category of the drug, which isn't very useful. Some category C drugs, for example, cause developmental defects in the first trimester, but wouldn't affect anything after that because the baby is already developed. When looking at yeast meds, my OB said that anything he rx'd in the second trimester on would be fine for that very reason, even though some of them are category C meds and have "birth defects" as risks found in animal testing. The baby won't be born with 3 fingers if all 10 fingers already developed in the first trimester.
And I'm pretty sure MY OB keeps up with the research and side effects of various drugs. He's really good to keep up with latest research on a lot of things. If your OB missed something like heart defects when you have a history of heart defects in your family, then I would question that particular OB, but not all OBs. Some doctors don't keep up with current research, and I'd stay far, far away from one like that. I've heard my OB say enough things that showed that he is keeping up with the latest research, that I do trust what he says about the safety of a drug. Yes, I will double check the info myself, but so far, everything my OB has told me has checked out, with regards to drugs.