you should get it, i get it in it keeps me from being sick alot
The shot isn't so much for you as it is for the baby. You could have almost no symptoms and still pass on a full blown flu to your new born, which is what your doctor is worried about. You are a healthy individual with a good immune system but that doesn't necessarily mean your newborn will be. And babies are much more susceptible to things like the flu, which could also weaken their immune system so they get added infections like RSV (which peaks in February and hospitalized 3 of my nieces). However, because of the type the flu virus is, its possible you could still get a different strand of flu and the vaccine wouldn't protect against it. (That is why there is a new vaccine every year, because the virus changes.) Also because you're pregnant there might be risk factors. I'm sure your doctor already knows about these and just believes it's more likely your baby will be harmed from the flu than from the vaccine, but you should be aware of them as well.
I would strongly recommend looking at the CDC website for the potential side effects of the flu vaccine and weigh up the chances of getting them versus your child getting sick. Personally, the only time I have ever considered or gotten the flu shot is when my grandma was going through chemotherapy and I was living with her. My mother, however, works in a clinic and gets them every single year. For both of us, it wasn't about protecting ourselves as much as protecting others.