Bode Miller is a pro ... at insemination ... 'cause the recently married Olympic Champ just filed two separate paternity lawsuits with two separate baby mamas -- this right after knocking up his own wife.
According to legal docs, here's how the baby-drama breaks down ...
Baby Mama Suit #1: Bode filed a petition against a woman named Sara McKenna -- who is CURRENTLY pregnant -- claiming he's the soon-to-be father. He's seeking joint legal and physical custody of the kid. He says the date of conception ... is unknown.
Baby Mama Suit #2: Bode filed against a woman named Chanel Johnson, claiming he's the father of her 4-year-old girl. He's asking the court establish joint and physical custody, and child support payments.
FYI ... Bode married Morgan Beck -- the same chick he hit in the eye with a golf ball -- in October 2012 and she recently announced her pregnancy ... with a due date set for August 2013.