No flu shot for me. The few times I have gotten it, I've had terrible reactions - pain in my arm for nearly a week, flue like symptoms that lasted weeks including fever, chills, nausea, headaches, etc. The research I've done hasn't convinced me that it *IS* safe, especially during pregnancy, I own a busy retail business and rarely get sick and have only had the flu a couple of times in my life so I feel safer skipping the vaccine and doing my best to boost my immune system as much as I can.
For what it's worth, I read a study that showed there was a 700% increase in m/c in women who were given the H1N1 vaccine a few years ago vrs women who did not get the vax - so while getting the flu can certainly cause m/c, you still only have a small % chance of actually getting the flu each year but intentionally getting the vaccine with a risk increase like that seems illogical.
Like everyone else has said, this is just my opinion on the matter and every one has to make the decision based on their own personal circumstances, like everything else in life.
Another anecdotal point to consider, have you noticed how you can get a flu shot literally anywhere? Grocery stores, department stores, Costco, literally anywhere. Why?? Because it makes those places money. It's a billion dollar industry every year.