fine, thank you.
May be they don't need or they will ask for it later. Keep it in case.
My Wife had to undergo a medical exam at ANAEM (French Government agency for Immigration) during the 1st year of stay there to get her 1st residency card, but she had a more complete one before in the Philippines (by an Embassy accredited doctor) as it's mandatory for marriage in France (she had to stay 2 weeks in Manila for this).
After when it should be done is linked to local regulations (3 months in your case). Ask where it should be done, as I suppose also you need an accredited doctor or clininc to do it.