Flu shot.... now I have the flu...

Had my 17 week appt yesterday and I asked my dr about the flu shot bc they had sent me a reminder to get one... I told him I have never gotten one before and he was like oh you definitely need one since you're pregnant, and we can go ahead and just do it today. So I get one... now I wake up this morning throwing up and feeling miserable... is it from the flu shot or just a coincidence? I haven't had morning sickness in weeks and it doesn't feel the same. I just don't know bc I don't normally get the flu shot. Any advice would be appreciated!