I have asthma, so I get bugged about the flu shot often even when not pregnant.
I got the flu shot every year or so while I was in the Navy, and I invariably got sick from it. I may be sensitive to eggs, so maybe that's why? My DD is outright allergic to egg whites, anyhow. Or it could be one of the additives in it. All I know is, "inactivated virus" or not, I got sick whenever I got it, fever, malaise, and cruddy feeling w/in 24 hours every time, for 3 or 4 days.
So, for me, I always say thanks but no thanks to the flu shot. I have a friend who gets hers religiously every year, and never gets the flu except if she skips the shot. So I think it varies from person to person.
Flu viruses are relatively easy to kill. I am pretty good about sanitizing frequently-touched surfaces and my hands, so I feel comfortable skipping the flu shot. I am, however, really vigilant about taking care of myself when I start feeling bad, and I will go in for Prednisone at the first sign of a cough, just to make sure I don't get any of the bad, long-lasting complications from not treating asthma properly in conjunction with a cold or something. I learned that lesson the hard way.
And, yes, the flu shot injection is the same for pregnant and non-pregnant alike. There is one "high-dose" vaccine for the elderly, and also a live, attenuated strain that you snort through your nose (flu mist) but those I think are contraindicated in pregnancy.