Dear L. P.
To answer your question regarding allergies that a baby can have prior to birth...it is true that all babies are subject to whatever the mother ingests, so therefore hand-to-hand, a mother can pass on allergies genetically as well as the intake of food or any substance.
If you already have a family history of allergies, then the percentage rises that your child will also have one or more of the allergies even if you do not. Many genetic predispositions can skip a generation appearing in the child but neither one of the parents. Babies can also develop allergic reactions through mutated genes or hormones.
I think that you should seriously consider stopping your intake of milk, especially, but possibly other dairy products until you know for sure that this is not presenting a problem for your unborn. If you find that its just a coincidence that your baby moves more during your intake of milk, then you wouldn't have any worries.
It is really best that bring this to the attention of your doctor, as you have stated that you intend to do, however I would do so today by making a phone call. Don't wait until your next appointment to ask the question...call now and many times your doctor's staff are quite knowledgeable and can answer your question without waiting to see your doctor. Getting an answer today is far better than waiting til your next appointment.
Good luck and congratulations on your upcoming new arrival !!!