Do you have a reputable reference for that, or is that something else you saw at an anti-vax site and fell for, hook line and sinker? That is one of the most egregious lies that anti-vax scammers spread. Take a little time to fact-check the nonsense you see on anti-vax sites, and you won't be tempted to post that bilge here.
It takes a *minimum* of 10 years to bring a vaccine to market, and that is only if all the stars align and the cards fall right. In reality, it takes 12 years or longer. That is because vaccine prototypes first have to be formulated and tested in vitro, then in animals. The best prototypes are then tested in a handful of human volunteers, in what is called "Phase 1", or safety, testing. The next step, Phase 2, is dose-finding, when the vaccine prototype is tested in a few hundred volunteers to find the optimal dose. After that comes Phase 3 efficacy testing, where the vaccine is tested in thousands of volunteers, usually in several sites around the world. After FDA approval (hardly a trivial process), the vaccine enters Phase 4, which is a post-approval process for gathering data from actual patients.
The FDA will not approve a vaccine for a group that it hasn't been tested in. So, if a company wants to sell vaccines for use in children, they have to be tested in children. If they want to sell the vaccine for seniors, they have to test it in seniors (age 65 and older). And so on. Furthermore, most countries want the vaccine to be tested on their own populations before they approve its sale in that country. For that reason, you can find concurrent vaccine trials going on in Japan, Brazil, France, Germany, Saudi Arabia, etc., etc.
As I have already pointed out, this process costs hundreds of millions of dollars. Contrary to what anti-vax websites would have you believe, it is not uncommon for a vaccine to have been tested in tens of thousands of people prior to FDA approval.
Learn to fact check. You can find the medical literature databased at www.pubmed.org. PubMed is a search engine--so if you want to look at whether influenza vaccine has been tested in pregnant women, just type "influenza vaccine pregnant" in the search box, and you will get over 600 results (I got 615 just now). You can type *any* search phrase you want, and you will find the literature about that specific topic, unfiltered by anti-vax scammers who, frankly, just want your money without providing anything of value in return.
Another resource is www.clinicaltrials.gov. Here, you can find the clinical trial registry. Again, it is a search engine where you just type the search term and get the results. It has, right now, 59 studies registered for "influenza vaccine pregnant." If I scroll through the studies, I can see the study design, and often the results.
These resources are available to ANYONE. And they are free, paid for with our taxes. There is absolutely no excuse for falling for anti-vax propaganda when you can look up the facts for yourself. Also, these resources cover more than just vaccines--they cover all medical issues. The FDA approval process applies to all drugs, not just vaccines.
Sorry, I am not up to doing a research project for you. How much are you paying? I know what I know about vaccines from years of reading and researching. The safety of vaccines is as sure as global warming. Ask the CDC.