Just FYI the CDC says the flu shot is very ineffective this year because the virus mutated too much. Could easily be the flu even though you've had the shot :(
Sounds like it could be early labor symptoms too
To me though, your symptoms just sound like normal pregnancy symptoms but it's always better to be safe than sorry.
Well you cannot get the flu from the flu shot itself because they give you a dead flu but it is possible to still get the flu after you've gotten the shot. It will not be nearly as bad as if you didn't get the shot. If you think you are having flu symptoms, call your doctor or get checked out because it can still be serious even after the flu shot and they need to treat it.