Here's a lesson in consumerism, the people.
Out of the entire internet globalsphere and all pages ever indexed by google, here is the total search results of any mention of "prenatal meds" found on the web's number one search engine.
"prenatal meds" About 2,350 results
There is no market, no usage, no broad appeal, no mass appeal, no hysteria over the term. It is basically a slang term for the word medications which will get you about an additional thousand results even with the non-slang term.
Good luck with your site.
If you have the power to create a site, go for it. I am sure in no time you could rank number one out of 2,350 results.