So far, birth certificates do not show what your blood type is even though your blood is taken at birth for health reasons. You can ask your doctor, donate blood, (If you are old enough depending where you live.) or just ask your parent(s)/guardian(s) on what you type is.
Cops LAC - 2010 Blood Types 1-8 is rated/received certificates of: Australia:M
From my research I haven't found a way to know for certain your baby's blood type before birth. You can however narrow it down some if you know the father's and your blood types you could make a punnet square.
To certify your birth?
Birth - 2011 is rated/received certificates of: Canada:13+
In the Blood - 2014 is rated/received certificates of: USA:R
In the Blood - 1915 I is rated/received certificates of: UK:A
Blood - 2004 is rated/received certificates of: Canada:R
In the Blood - 1989 is rated/received certificates of: USA:PG
Blood - 2000 is rated/received certificates of: USA:R
In the Blood - 1923 is rated/received certificates of: UK:A
Switched at Birth - 2011 is rated/received certificates of: Netherlands:AL
Birth of a Band - 1954 is rated/received certificates of: USA:Approved