Through Sick Kids Hospital in Toronto, there is an ongoing study of medications that are okay to take during pregnancy
. Especially medications that help to relieve pregnancy
symptoms (headaches, nausea, constipation, etc). The group is called MotherRisk and they are world-renowned as one of the best study groups surrounding this topic. This is partially because their study is not funded by a pharmaceutical company, so they don't benefit from saying certain drugs are okay.