Milk question

So my daughter turns one on Friday, her doctor wants her to try whole milk before going straight to almond milk, since they aren’t sure if she has a milk allergy or not(they never tested her, but she had a problem gaining weight with breast milk and then with regular and soy formula so she’s on nutramigen). anyways, this weekend is really busy, with her birthday party, we also have 2other parties to go to. Would it be okay to try milk today even though her birthday is 4 days away?